Is there any tool which can automatically extract all possible scenarios from an use case UML diagram?
No I don't think so. The problem is that the Use Case diagram is almost entirely content free in UML. It's really just a guide to how to read the use case body specifications and documents their relationships. A test case generator would need to read the use case bodies, however UML doesn't define a standard form or semantics for them, so there's nothing for a test case generator to work with.
Related
The above use case diagram is to detect fall
So basically, I was trying to use the 'Alarming', 'send SMS' and 'stop SMS' use case as an extension from the base case 'detection of fall' but they also have include relationship as shown in the diagram. Therefore, I tried to do it as shown in the diagram above
Any comments, please? Is it correct?
If you feel the obligation to indicate if conditions in a use-case diagram, it should probably not be a use-case diagram anymore. Try to represent this as an activity diagram, and simplify your use case to something as simple as “Alert for situations of distress”.
I am trying to draw a use case diagram for navigation. However, I am not sure if it is correct since the 'call out address' base use case is being used as included use case.
Any comments on the above diagram please?
This is not a use case diagram. Your bubbles contain Actions being part if some Activity carried out by a use case. A use case shows added value an actors gets from the system under considertion. Please start at square one!
I recommend reading Bittner/Spence about use case modelling. The best read you can get on that topic.
Is use case narrative part of the UML?
A textual description of the business event and how the user will interact with the system to accomplish the task.
First of all, UML means Unified Modelling Language. It is a language which helps in designing and modelling software systems. So use case is not a part of UML. UML is a tool that helps to represent Use Cases (Among other things). And Use Case Modelling is an approach in requirement engineering for understanding and describing the functional requirements of a System.
It can be both narrative and graphical. Textual representation part is called use case specification while the graphical representation part is called Use case diagram.
So what is a use case? A use case is a summary of scenarios for a single task or a goal like "pay bill" in the above image. And a Use case model typically consists of several use cases. It helps to provide a clear picture about the external actors (both users and external systems),the functional requirements of the system and the relationships among them which in turn leads to a better design.
I'm going to assume that you mean "use case narrative." That given, the short answer to your question is "no."
A "use case narrative" is a document that describes the entire behavior of a use case. The UML doesn't define documentation methodologies specifically, so this isn't part of the UML specification.
The UML community has yet to build any sort of consensus on a term for this document (and, indeed, exactly what it ought to contain). Nipun Sampath, in his answer, calls it a "use case specification," for example, and muszeo calls it a "textual description," which, of course, it is.
The behavior of a use case would be modeled in UML as an activity diagram. So, an activity diagram is a diagram of a use case narrative.
For more information on use case narratives, see this post.
I believe you mean Use Case, rather than User Case. The description you give (textual description of steps to accomplish a business task using a system) is broadly what Use Cases are about.
To be clear, a Use Case is a kind of functional requirement; namely a description of a process that a person and/or system (role(s)) performs with information to accomplish an objective that has business value. With Use Cases this specification generally starts with a model ('blobs on a page') which illustrates the process, system and actor (role) context, with a textual description and/or supporting models (e.g. Activity Diagrams) to express the steps of the process. There are other ways to express functional requirements -- User Stories and BPMN process charts are two other examples that achieve the same thing but in different ways. You may be confusing Use Cases and User Stories, perhaps.
I understand the appropriate use of extend and include , however all the examples I could find draw single large use case diagram with extend or include within the system boundary of that single use case diagram.
Our current project has a base use case diagram with different specialisations from that base use case diagram. Each diagram is on a different page in the document and due to their combined size, including all of them into a single diagram is not a good idea. I would like to know if there is a standard or conventional way of communicating this inheritance tree of separate use case diagrams? If there is not, what would you recommend is the best way to go forward with this dilemma?
Uses Cases inheritance
Does this image extracted from UML speficitaion helps you ?
A point which is not clear for me, are you dealing with Use case inheritance or diagram inheritance ? To tell the truth, I never used diagram inheritance and I am not sure if this is possible and the meaning of a such usage of inheritance.
I have seen many use case diagrams where a use case can be included to only 1 other use case, is this right or wrong? I have the understanding that in order for a use case to be included, it must be included to minimum 2 other use cases to be considered.
If this is true(minimum 2 use case to be considered an include), if its just linked to 1 other use case, do i just use a normal association? thank you
This is a recurring question and often interpreted the wrong way. Include does not mean "call" in a functional analysis sense. It means "this is a use case which can optionally be included". E.g. if you have a tool box you sell with different tool sets (different licensing for software). When you model use cases you synthesize single actions in a form so they build a set that returns some value to the actor. You will not divide pieces of value into smaller ones.
Use cases are about synthesis, not about analysis. When your use case diagrams start resembling spider webs then your design is broken.