Find valid slaveaddresses or number of slaveaddresses in minimalmodbus - minimalmodbus

The documentation doesn't offer a way to do this and as far as i know a bus is not designed to do this. But maybe there is a kind of answer one can get from the devices without disturbing anything to determine which ones are there?

Searching a lot did not yield any answer besides "try every possible address and see if you get an answer"
Given that professional software also seems to use this aproach, it is probably the only way.

Related

Tricks for searching on msdn

Foreword
Before asking a question that probably will pretend to downvoting (as it seems to me) I remebered an answer on
meta
I like getting MSDN links as answers because MSDN is so hard to navigate, it's one of the worst sites to find something in.
Question
Suppose I'm new to some subject. But I know what I'm searching for and this could be some symbol operator (+,-, etc). Seems easy. Then how to find an article describing some directive like # (for asp.net)? I'm aware of what it is. Besides I'd been trying to search code blocks, rendering etc. And I was typing asp.net every time. As a result I met some articles close to my question but not similar. So are there some tricks for a searching string on MSDN?
The pro trick for searching on MSDN is never to use the MSDN site search. Always use Google.
I can usually find exactly what I'm looking for on MSDN by typing in the name of the concept/type/etc. because it's either the first or second result on Google.
Failing that, you can always use Google Site Search and explicitly instruct it to search the MSDN library. To do that, use this form of search query:
"your search term(s)" site:msdn.microsoft.com
I never understood that comment on Meta. I can count on one hand the number of times I've had trouble finding something on MSDN, and I'm a Microsoft-stack programmer with a terrible memory. I use the site all that time. I might be able to give more specific advice if you gave a specific example.

Any experiences with Web2Cal?

I need a calendar-widget for my website. This calendar needs to be very flexible. An option is to write it from scratch, but I think, if kept at a reasonable price, it would be a better option to buy the code.
So far I've come up with Web2Cal which looks great. I downloaded the free-version, to see how it would be to work with, but I feel like I'm running short on documentation. Does anyone have any experiences with this 'widget'? Is it worth spending some dollars on it?
Double bonus question:
Do you know of any better place to find documentation on Web2Cal than their primary website?
Do you know of similar tools, which you liked (commercial or free-to-use)?
Thanks in advance :)
[EDIT] If it makes any difference, the server code is being done i ASP.NET.
Did you try daypilot.org? that has a component for .NET
Web2Cal is certainly nice, I noticed that their support system is nice. They respond to all questions. Web2Cal is more flexible.
If you feel daypilot satisfies your needs go for it.
For some reason, I feel web2cal is more easy to customize and versatile than daypilot. To make up for the documentation, their support is pretty good. I guess that is true for all new softwares. So take advantage of that feature, post like 300 questions to them to get your work done.. ! saves you a whole lot of headache.

Vulnerability & Exploit Case Studies

I understand the general idea of how vulnerabilities are exploited. Buffer overflows and stuff like that, but I guess I don't REALLY get it.
Are there useful sources of information that explain this area well? Maybe case studies about how particular vulnerabilities were exploited?
Even more interesting would be how projects you have worked on suffered from these kinds of issues.
I'm not trying to learn about currently existing vulnerabilities that I could exploit. I'm trying to get a feel for how this area could have an impact on any projects I may work on.
iss.net has articles on different examples of exploits, mainly explaining how to secure your system.
The corelancoder tutorial! A must read
https://www.corelan.be/index.php/2009/07/19/exploit-writing-tutorial-part-1-stack-based-overflows/
Part 1 is a single BOF on windows, ... , Part 12 is ROP. It is hard, but the first one can be done in a day or two, and it should give you a real feeling on which difficulties one finds when writing an exploit, and on which countermeasures are useless/useful.
The problem with this area is that it is unclear until you try out something on your own, but that requires time. You could also check Metasploit to exploit problems directly (to have an idea of the impact) - you will find a list of exploit to fire to a target. If you need a target, use Metasploitable http://www.offensive-security.com/metasploit-unleashed/Requirements#Metasploitable
If you want practical examples of real life exploits, I totally recommend the book
"A Bug Hunter's Diary: A Guided Tour Through the Wilds of Software Security"
It's exactly what you want. It's full of case studies and real life examples of almost every type of exploits and it explains it from the finding to fully writing a working exploit.
Also there are some examples in the book "The shellcoders handbook" but it's not as comprehensive as "The bug hunter's diary" Also "The shellcoders handbook" is pretty big and I only use it as a reference when needed.
Also sometimes I keep reading exploits from "http://www.exploit-db.com" and it helped me a lot but keep in mind not everything can be taught so sometimes you will need to improvise based on what you have and what you can control it's hard at first but it will make you feel great when the exploit runs and you see that calc.exe :)
Of course corlan tutorials and other tutorials are a must to know the essentials but they only teach you the basic concepts and you have to see some real life exploits in action to really understand the possibilities.

How to Deal With Fear of Custom Dev [closed]

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.
Closed 11 years ago.
I'm dealing with an issue with my current employer that has seriously made me consider seeking employment elsewhere. They are under the impression that 100% of custom development should be eliminated and replaced with COTS products, such as SharePoint. While I realize that this is not a realistic expectation, I've found it impossible to argue my points with the people in management that share these views. Their argument usually involves something along the lines of a feature already existing in SharePoint that covers feature X, therefore there is less risk involved and testing doesn't have to be done against it.
Case in point, we have a situation where a SharePoint list is completely incapable of meeting customer expectations and requirements. Saving this data in a SQL database, however, would easily satisfy the requirements. Any time our development team suggests going outside of the boundaries of SharePoint, however, management goes up in flames about how every line of code adds to the complexity of the project and increases risk. While this is certainly true in some situations, it's not always the case. Their argument, however, is that since SharePoint provides a mechanism for storing data, that we should use it 100% of the time. Regardless of if it meets customer requirements, or not.
I've gotten to the point that I hate coming to work because I'm constantly forced into doing things that I know (with 100% certainty) are not right and that could be made right by doing custom development. It's simply what seems to be an impossible argument where I work, however.
Have any of you experienced a similar situation? If so, what have you done to work through these challenges?
If you don't share the vision of the company and if you can't enlighten them then sure, it is a good time to start looking.
Have you pointed out that there is risk in forcing a "solution" on a client that does not help them or is missing functionality or is unusable?
Perhaps come up with plans to address and mitigate their perceived risks.
You document your concerns and let those above you know them, and then you do as they ask. If it doesn't work, you have documentation that you brought the concerns up. But try to make it work their way, so it doesn't look like you're trying to undermine their plans. They're taking the greater risk, and thus they get the greater responsibility. Try your best to make it work their way, and quit worrying about it.
This may sound bad and may not be the answer you want. There is a little known division in my office called "The Skunk Works." People, on their own accord (usually during lunch breaks or compile time) decide to write little programs that help the company. The fun things about this is the result doesn't "cost" the company anything.
The conversation usually goes like this:
"We need to buy this software" -Boss
"But, we have had that thing for months. John, wrote that back in the day" -Programmer
"?" -Boss
A lot of times the developers see a decision as being bad and just create a parallel process that happens automatically. Then, when the stuff hits the fan and the customers are frustrated, the alternate solution is ALREADY in place.
I have an example of an auto release machine. Developers used to create these custom reports. As our customers increased, the developer's workload increased. The problem was "In order for the customer to get the custom report developer had to be involved." So, while the company was looking into hiring someone to do reports full time or to find ways to have the customers do them, I wrote an auto release machine that looks for report changes and releases them directly to the customer. I also wrote a utility that allows anybody to make changes to the reports that was easier to use than what the developer has. When the Boss made the announcement of trying to find a solution, I told him that it was already in place and that even he could make changes to reports and get them released. Now, everybody can change reports, usually it is management and customer support who make these changes. The fun side is that developers arn't involved anymore.
Just do it. If you're going to quit anyways, might as well try.
Does someone in management own stock in SharePoint? Was the system developed by the CEO's younger brother?
If they are that resilient to change, you should find out the real reason before trying to argue with them. They may claim that there is added complexity, difficulty testing, etc, but if you can counter every argument with one that shows their position, with all due respect, to be misinformed, and they still won't discuss, then you may be arguing the wrong point.
If they are locked into the technology because of a non-technical reason, such as someone once read that SharePoint is the ultimate in any technical situation (and, of course, had no clue what the article was talking about other than SharePoint = good) then you shouldn't bother trying to argue and save your energy. For the job hunt.
Prove it to them. When the requirements ask for a list that can handle 100,000 items with a multi-column sort - write a script that adds 100,000 test items into a sharepoint list and let them try it, preferrably with the "customer" requesting the list watching. :-)
I would definitely get my resume out and into the open if I were you. Not only is the experience that you are currently having frustrating, it can really hurt your career development over the long haul. Just think about it. While you are languishing with your current employer in your current position, other developers are adopting new technologies and expanding their experience.
There is such a thing as ideological differences between developers and what a company's idea of a role for a developer is. If open discussion and candor get you nowhere, you will not be faulted for a lack of effort. Loyalty to a company is a good thing, but the relationship needs to be a two-way street.
Sadly, the will eventually probably come to realize that they are wrong in their assumptions - but you can not wait for that day to come. Sometimes it never comes. In particular (and don't get me wrong, I love SharePoint when it is used for what it is intended for), SharePoint is become the next Access, in that people who read management magazines see enough of it thrown around to call it the messiah.
I find that there is typically no way of 'winning' these debates through talk alone. Many managers form an opinion of a product or solution through reading management oriented articles. See if you can find some counter-articles.
If you can cite examples of things which SharePoint is incapable of doing, and show examples of how you can cost effectively solve these problems through custom development then you are well on your way.
The mistake is to try and make this a conversation about technology, it's not, its about efficiency, cost effectiveness and maintainability - those are the mantras and metrics which will sway non-technical managers into considering alternatives.
If you can put together a proof of concept for some of these issues so much the better, eye candy really helps to sell outside of technical teams.
Finally, good luck :)
I am doing the same thing at my current job, there is no easy way to deal with this kind of situation. All I have been able to do is swallow my arguments, cause they have gotten me no where, and do as required by my management. This off course will go against your basic programmer nature of using the best solution for the task at hand, and maybe getting to build something cool in the process, but since they are the boss it is really your only solution. You could try to site cases, with evidence, where it makes more sense to use custom solutions. But if you boss is anything like mine, it won't get very far before the screaming match begins. The only other solution is dusting off that resume and finding a new job.
I have faced the same kind of challenges right from day one. Management have a natural reluctance to add custom code to the solution. However in most cases it has been posible to explain than the right solution for the customer would include some custom code.
Remember, if you argue that you can include the custom code in the common codebase, then the boss might approve the idea.
I really feel your pain.
If it was me I would use my spare time to collect information that proves my point and document it in a easy to understand way.
If they only understand money, talk money, if they only understand fear (doing "this" because they are scared of "that"), use the fear, finding scary thing for them in "their" solution.
Document every new implementation, the time, money and problem that arises. And document what your solution would be instead.
They probably doesn't see the problem in their solution, because they focus on not having problems in "your" solution.
I have worked in a place where management were not constructive in their approach, not quite as bad as you describe, but bad enough.
There are a couple of options. One is to go ahead and do what needs to be done for the client with the best "value for money" option you can. You will probably have to get the developers together as a team to make this "civil disobedience" work.
A more forceful approach that will really make the shit hit the fan is to go to the client (don't do this if it is an external client or if you wish to keep your job) and lay out what is going to happen to this project if X and Y. This is pretty much telling tales out of school and is going to be bad, but entertaining.
A slightly better way is to go up the chain and get a sponsor who can make shit happen for you. Essentially go behind your boss(es) back. This may work, but it is going to have predictable results for your relationship with your management.
Last and hardest is to identify the person who holds the view that any custom code is bad and engage them in conversation to find out where they got the belief and counter that with examples. Emphasis on conversation as you will have to listen to and understand their underlying concerns (which won't be about custom code per se) and only address them after you gain that persons trust.
I cannot tell you which way of doing things is going to work best because it depends so much on the individuals involved. All I do know is that you cannot change people and in my experience the best way to solve the problem so far has been to leave and work with people who are not so...
how about not calling it custom code. If instead you call it 'anticipated SharePoint user extensions' or something it may soften the misconception surrounding a specific term.
also, as has been said, there may be other hidden from you reasons that management is pushing this agenda. It is probably best to not second guess these too quickly, as many would be valid.
Finally, there are alot of places that need development. it doesnt hurt to look for a better match.
good luck.

How do you find out what users really want? [closed]

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.
Closed 10 years ago.
I've read somewhere (I forget the source, sorry - I think the MS Office developer's blog?), that when you do a survey of users asking them about what features they would like to see in your software/website, they will more often than not say that they want every little thing, whereas collected metrics show that in the end, most people don't use 99% of these features. The general message from the blog post was that you shouldn't ask people what they use, you should track it for yourself.
This leads to an unfortunate chicken-and-egg situation when trying to figure out what new feature to add next. Without the feature already in place, I can't measure how much it's actually being used. With finite (and severely stretched) resources, I also can't afford to add all the features and then remove the unused ones.
How do you find out what will be useful to your users? If a survey is the only option, do you have to structure your questions in certain ways (eg: don't show a list of possible features, since that would be leading them on)?
Contrary to popular belief, you don't ask them. Well, you don't listen to them when they tell you what they want. You watch them while they use what they have right now. If they don't have anything, you listen to them enough to give them a prototype, then you watch them use that. How a person actually uses software tells you a lot more than what they actually say they want. Watch what they do to find out what they really need.
Give them options and the have them arrange them in order of importance. As you said, the users are going to want everything, but this will allow you to tell what they want the most.
You tell them. Then both of you know.
(No, your users won't tell you what they want. That's work. If users wanted more work to do, they wouldn't be looking for software to do their work for them.)
An anecdote from a previous life:
We were planning for a new release and wanted to add some new features to the application. We got the users together and brainstormed what things they wanted to see in the system, placing each "feature" on a yellow sticky on a white board. We then grouped similar requests together and eliminated duplicates or near dups.
We then laid each sticky on a table with a cup in front of it. Each user got 10 pennies to "vote" on the features they wanted. They could put as many pennies in each cup as they wanted, up to all their pennies in one cup if they so desired. We then counted the number of pennies in each cup and chose to implement the top 5 vote getters, in order of votes.
It was surprising to see people that were passionate about a feature while brainstorming and categorizing turn around and not vote for that feature (or vote lightly for it).
Of course, a technique like this will only work if you have ready access to your user base (this was for an enterprise system we developed internally).
You ask them.
(No, you do not know what your users want better than they do. Yes, you will get a lot of stupid answers. Avoid multiple-choice surveys and instead opt for reviewing free-form answers. The information you collect will be invaluable.)
Of course — you could always allow your users to vote on which features they like most...
Users know what they don't want better than they know what they want.
We had brought in a team do do an Oracle eBusiness Suite implementation. They took an interesting approach that had worked very well for them in the past. But it was phenomenal in our environment.
We had cultural issues which meant none of the users were going to stick the necks out to say what they wanted. I had history with the users from the past. Trying to get get requirements out of them was like trying to get blood from a stone. But once you went live the bitching would start.
Anyway the implementation team installed Oracle eBusiness Suite straight out of the box. Give the users the basic training. Then about every 4 weeks for the next 6 months they customized the base installation to accommodate the complaints.
I would recommend against showing them options; as you point out, if it's available, then people will want it just for the sake of having it. Often the users are not aware of the extra costs of developing a particular feature, and just want it because you mentioned the possibility of having it.
The other option is to show a list of all the features you could possibly add, and then attach a price to each one, and then ask users, would it be worth $X to have feature Y, or, how much extra would you be willing to pay for feature Y?
Eat your own dog food
Try to use the application that you write yourself as much as possible. Then you will know how you can improve your application.
According to 37 Signals - Getting Real book, you don't do anything, you don't even record what they want, you just delete mails after one read without any action.
When it comes to implement / fix stuff you'll remember the most important things that your users want from top of your head. Obviously this requires a bit user base.
You need to tie features to cost. Everyone wants features, but not every feature is worth paying for. Ask which features are most important, which would your users be willing to pay for? Develop features based on the priorities supplied by users and stop when they aren't willing to pay for any more. Get the product into their hands as quickly as possible so that you can get real feedback on what doesn't work and what needs to be added. When the users have access to real software, you get much better information. This works best when you are developing specifically for a particular customer. If you don't have access to real customers, consider seeding your product with people (can you say, public beta?) free in order to get better feedback.
Users don't know what features they want. You don't know what features they might be offered. "Features" don't mean anything except as they help them accomplish tasks and achieve goals. And that's where you should start, because they will have a very imperfect understanding how they relate.
There is one thing they know, maybe, much better than you do. And that's how to get their jobs done.
As soon as computer/software concepts and terminology start to leak into the discussion between users and designers, you're off the rails.
So many times users will focus their requirements in terms of what's wrong with, or could be improved about, the software they currently use. Over time, even they lose the distinction between their jobs, and the software they use to do their jobs.
It's a very hard, critically important problem for you to solve this.
The only way to know what the users "really" need is to "be" the user.
Its programming kung fu black belt level.
"Be like water making its way through cracks. Do not be assertive, but adjust to the object, and you shall find a way round or through it. If nothing within you stays rigid, outward things will disclose themselves.
Empty your mind, be formless. Shapeless, like water. If you put water into a cup, it becomes the cup. You put water into a bottle and it becomes the bottle. You put it in a teapot it becomes the teapot. Now, water can flow or it can crash. Be water my friend."
When you be the water/customer, you'll now.
I think Bruce Lee would be a good programmer.
Im very serious. This is the way I work. I cant do things I dont understand, so I have to understand before I do things. When I understand, and my costomers know I understand then I can do a good job. Without understanding there will be missunderstandings. You are the only person who know when you have the correct level of understanding, you are also the person who is responsible to get that knowledge.
The Oracle at Delphi
Pros: accuracy is superb
Cons: if you can interpret the messages, which many people fail to do (often seeing what they want to see). Also requires supplication, which can get messy (contrary to popular opinion, your hecatomb need not be 100 of the same type of livestock).
Psychics
Pros: accurate to a point.
Cons: rare. Prone to mental instability, highly vulnerable to eldritch beings, and might attract unwanted attention from them. Also, it takes experience to sort through the mystery that is the human mind to get to desired information. And sometimes you still need to probe subjects while they're actually doing the thing they need help with, since users lie.
Plant a mole
Pros: New gadgets. New Poisons! Plans within plans within plans. Baby's a freak show. You might learn all sorts of fascinating things in addition to the information you need to help the user.
Cons: Expensive. Chances remain that the agent will turn on you, or fail to learn anything you couldn't learn more simply. If discovered, organization will likely turn or liquidate the asset, which represents a huge investment of resources. Organization might reciprocate.
Guess
Pros: Take a group of people with average to great imaginations and problem solving skills, give them some booze and inspire them with some quotes from Ghostbusters, Big Trouble in Little China, or The Big Lewbowski. Who knows where it will go, but it'll be fun and they might produce something interesting/useful.
Cons: Chances of meeting user's needs are higher than you think, but not that good.
Ask the user
Pros: users feel empowered as part of the process.
cons: until they have to decide on anything, at which point you are on your own. Unless the user is a very experienced user, in which case they probably have a good idea of what the want. There's only like 4 experienced users on the planet though, and nobody ever knows anyone who gets to do a job for them. They may be mythical beasts.
Pretend you care and ask the user (even though you don't really), and then observe them doing whatever key workflow/process/etc is involved and pay attention to what they do.
Pros: you trick the users into thinking their opinion matters, which empowers them but doesn't deliver any other baggage. Since users lie - no purposefully or maliciously mind - you actually get to see them in action and get a better grasp of what the problem is, thus giving you a better foundation for building a solution. Also, you avoid the psychic route, and thus avoid a long and winding road that begins with promise but ends with you and the psychic being eaten by some monstrous, unspeakable thing that is not of this world. Observing the process is like totally Zen, which is good for your Developer Mystique.
Cons: No road trip to the Oracle (which would be EPIC). Spies are much sexier; chicks dig spies. Ghostbusters|Big Trouble in Little China|The Big Lewboski probably aren't involved. Feels more like work than the rest of the options.
Asking users about features will prompt them to talk to you about features.
If you want to find out what users really want then you are talking about understanding their goals and motivations. I've found the easiest way to start doing this is user interviews, not about features but about how users use your product and products like it, why they are using it and how it fits in with their life.
Once you build an understanding of what your users are trying to do with your product and why they want to do it you are in a position to make an informed judgment as to whether the features people requested are what they really need.
Ideally I think your problem is about understanding users rather then just listening to their requests.
This is an old question with a lot of good answers already, but I thought I'd just add a little bit of personal experience for the sake of people who end up here in the future through a search like I did.
If your project does not need to gain an audience as quickly as possible in order to succeed (like a webapp) if it's more of an internal project or product to be sold for a fixed client, or type of client, then I believe your best bet is to go the 37signals way: give your users the absolute minimum they need in order to accomplish the most basic tasks of the most basic cycle of work at first, then listen to what they say it's objectively missing in order for them to do their work properly. Not what they want or would like it to have, but what they really need. And the only way you know for sure what you really need is when you don't have it.
I worked as the designer in the development team of an intranet-based "heart-of-the-company" app that followed that strategy, and the results were wonderful. First week: everyone was pissed. When it was over, 90%+ of approval, and the app was still simple and beautiful. And most of the people who were not entirely satisfied seemed to understand why it couldn't be like they wanted, and the main request of nearly everyone was to, whatever we did, keep the app simple.
Again, if you're working on a product or website that needs to attract people first, that might not be feasible or delay things a lot. But if you have some control or leeway over the userbase, I'd definitely recommend this approach.
You don't ask for features. You ask for problems. Pain points. Find out what they hate about their current solution. Find out what eats in to their time.
When you know what they don't like, then you build the solution to those problems.
When you solve real problems, then you're creating real products that people will gladly give you money for.
But what's also important is respecting them during your research phase. Surveys are still great for doing research, but if you ask them a dozen questions, they will hate you. You need to respect their time and use a survey tool that engages them and leaves a great impression.
It's a proven fact users don't know what they want. What you need to ask them is what is wrong with what there is now - what problems are they having with your software? why aren't they using x feature and y control? why interaction x worked for them while interaction y made them try to gauge their eyes out?
Of course to be able to ask those questions, you need to do some field study and see what features are used, what patterns your users exhibit and analyze that data. That analysis will give you the base for much more specific questions which users are able to answer decisively and accurately.
If you're serious, you videotape them at their work, and then you break down what they are trying to accomplish and how your product can help them. This is part of a whole discipline called usability engineering. A good introduction to technique is Jakob Nielsen's book Usability Engineering. Back before he became a shameless huckster, Jakob was a very good scientist and he learned a lot about cheap ways of figuring out what users need. Especially good if you're on a budget. What impressed me most was using paper prototypes; this is a great way to mock up software you haven't built yet and helps answer your question about what to build next. Until I saw this technique in action I couldn't believe how effective it could be.
P.S. One example of what happens if you just ask people: 90% of the feature requests for Microsoft Office 2007 were for features that were already in Microsoft Office 2003. In that case what users needed were better ways of finding what was already there. I wish I could find where I read about this... sorry not to have a reference.
I'm assuming based on your wording that you are building a product to sell, and not building something to order for a specific client.
In that context, I'd say that you should start by becoming a user yourself and building the features you need in the way that you want it. As you evolve the product, you'll need feedback from other users, but this at least this gets you started and breaks the chicken-egg cycle.
As for measuring actual usage of features, you can set up a discussion forum to get feedback on the features you added... you don't need anything too complicated if you are time-strapped.
I personally like the hands off approach from customers. They give you high level requirements and you provide the implementation. Your software team/company/division are supposed to be the experts. Sure you will make some mistakes, if its horrible the customer will pipe up and you will fix it, but generally having the implementation up to you and your developers is a fun dilemma to solve.
Research, research, research. Learn from others designs, then make your own kickass design. Not easy but then again they don't pay developers the big bucks for nothing.
That's a good question.
If you're building an FPS game, you really need to know for yourself what should be included, because 99% of your users will never contact you to say "I wish your game just had X". An experienced beta-testing team can help here.
If you're writing an accounting application, you need to understand the industry and what users are trying to accomplish when they use your product, and try and focus your feature set around those goals.
If you're writing a custom app for 100 users in one business, you could have a chat to the dozen or so most avid users of the software. They're the ones who know all the forms back-to-front, have discovered all the undocumented shortcut keys, and have also figured out how to circumvent many of your data validation rules.
Imagine you are them
Use Cases.
What will they do with that feature?
It works like this.
People take actions. We build software to help them take actions
In order to take an action a person must make a decision. We build software to help them make decisions.
In order to make a decision to take an action, a person needs information. We build software to collect and present information.
Every feature must be an Action, a Decision or Information. And the connection had better be direct. Information that does not lead to a decision or an action isn't even "nice to have" -- it's junk.
Users say a lot of things. What do they do? What decisions do they make? What information do they need?
Edit
Note that not everyone is good at describing use cases. Some people have no vision and will simply tell you what they do today without understanding how they are creating business (or personal) value. They may not really know what decisions they're supposed to be making, and are vague on the information they need.
Other users know what value they create, and why, and can discuss use cases well. They can envision alternative ways to create value; they can articulate options for their actions. Decisions don't have a lot of alternative implementations (people make decisions, not software) and the information required doesn't change much, either.
Watch them.
Identify bottlenecks in their work
Create something that solves that
bottleneck in an elegant way
Let them use it
Repeat until everyone is happy
Based on the principles:
Users know what they want, but they
don't know what they really need.
You ARE
NEVER going to get it right the
first time.
It seems like a chicken-and-egg problem. Much like computing PageRank. A page's page rank is dependent on the PageRank of other pages linking to that page.
One way of computing PageRank is by iteration.
Iteration is the key!
A. Voting
Gather a biiiig list of features all users want (make them enumerate each feature they want).
Then have them review the list and allow them to vote on features. Say, give em 100 points to distribute on features. They can give more than 1 point to a feature.
B. Analysis
Analyze the business model, List the features that you think is needed.
This is needed because:
users sometimes don't get the big
picture
you have this REALLY great
idea that users won't think of in a
bajillion years.
C. Implement
Analyze list from A and B, merge, remove a few, improve some. Implement.
D. Test
Test it on users. Hear their complaints. Look at
- features they use often
- stuff they get stuck on
- etc etc etc
E. Iterate
Usually, users do not always know what they want and whether they want anything. In our company sales people go to existing and potential customers, show them our product and explain them why they desperately want that.
In my time in university we were taught something called "userp-driven development". Here you really have to go to the customer, observer how people there work, what tools do they use, and try to find out what could facilitate their life. You then create a mock-up, go to the customer again, present it to the users, get their feedback and then proceed to improve your mock-up. When everyone more or less agrees to the course of action, you do implementation, regularly showing the customer what you have trying to get correction feedback as early as possible.
Important is not to talk to the managers who want the product, but to the users who will use the product. Otherwise the whole play will bring you nothing.
P.S. Asking them directly "What do you want?" could be a dangerous question...
Babylon 5 - What do you want?
It's called Market Research.
No, this wasn't a dig at the guy, that's really what it is about. Sure, there's a bunch of techniques that UCD people use in the field to get user requirements, but they are exactly the same tools used by market researchers. Card Sorting, Priority lists and so on are all market research terms.

Resources