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New Post 6/27/2008 8:01 AM
User is offline Requirements Czar
6 posts
10th Level Poster


Implementing Use Cases in our organization 

We are trying to implement use cases in our organization as a tool for better capturing functional requirements.  However, since most of our applications are 3rd party and not built from the ground up, how does this affect how we write our use cases?  Or does it?  A majority of our work is customization of these vendor applications.

 
New Post 6/30/2008 6:22 AM
User is offline Tony Markos
493 posts
5th Level Poster


Re: Implementing Use Cases in our organization 

Hi:

Graphical use cases are for to-be design of relatively finite systems.   Text based use cases are for to-be design of even smaller scale systems.  Your situation seems to require as-is modeling for (maybe?) larger scale integration. 

Also, maybe consider the need for business process reengineering, as the major benefit of larger scale automation efforts often revolve around simplification of existing business processes.  Use cases are not a business process reengineering tool. 

Tony

 
New Post 6/30/2008 6:22 AM
User is offline Tony Markos
493 posts
5th Level Poster


Re: Implementing Use Cases in our organization 

Hi:

Graphical use cases are for to-be design of relatively finite systems.   Text based use cases are for to-be design of even smaller scale systems.  Your situation seems to require as-is modeling for (maybe?) larger scale integration. 

Also, maybe consider the need for business process reengineering, as the major benefit of larger scale automation efforts often revolve around simplification of existing business processes.  Use cases are not a business process reengineering tool. 

Tony

 
New Post 7/1/2008 1:37 AM
User is offline Rob Winter
4 posts
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Re: Implementing Use Cases in our organization 

Our organisation is following a similar path, with the added variation that some projects could be aimed toward procurement of new 3rd party software.

The business analyst role here keeps use cases fairly simple (or 'black box'), concentrating on what the system does, not how it does it.  In that respect then, our use cases would be just the same regardless of whether the project was aimed at procurement, reuse of existing assets, or new development.

The next stage is where the different project types diverge.  For a procurement, we would send black box use cases to potential suppliers.  This level of use case gives suppliers a bit of freedom to gear their products toward a viable solution.  For reuse of existing assets or new development, our systems analysts and developers would analyse the black box use cases and begin to move into the solution domain, looking at how the system will provide the required functionality.

 

 

 
New Post 7/1/2008 9:58 AM
User is offline Tony Markos
493 posts
5th Level Poster


Re: Implementing Use Cases in our organization 

Robert:

Question:   Don't  you have a need to formally address data flows?

The application integration projects that I have worked on (including integrating of a 3rd party package into an existing organization) have always required a significant amount of data flow analysis.   After all, the required data flows are the essential interfaces between a (3rd party) system and the outside world, including to other systems.   Unfortunately, use cases do not capture data flows.

Tony

 
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