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Peter Van der Straaten

Google Insights - UML tools - 0 views

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together papyrus enterprise architect uml tool umbrello argouml

shared by Peter Van der Straaten on 23 Sep 11 - No Cached
  • Peter Van der Straaten on 23 Sep 11
     
    Note: Papyrus is also a ECM tool
Peter Van der Straaten

Alistair.Cockburn.us | Why I still use use cases - 1 views

alistair.cockburn.us/Why+I+still+use+use+cases

agile use case user story uml cockburn debate

shared by Peter Van der Straaten on 25 May 12 - Cached
  • XP pretty much banned use cases, replacing them with the similar sounding “user stories”
  • Scrum did similar, using the “product backlog” instead of user stories
  • Yet as I go around projects, I keep running across organizations suffering from three particular, real, painful, and expensive problems
  • ...15 more annotations...
  • User stories and backlog items don’t give the designers a context to work from
  • don’t give the project team any sense of “completeness
  • don’t provide a good-enough mechanism for looking ahead at the difficulty of upcoming work
  • Staring at the set of extension conditions in a use case lets the analysts suss out which ones will be easy and which will be difficult, and to stage their research accordingly
  • Here 5 reasons why I still write use cases
  • The list of goal names provides executives with the shortest summary of what the system will contribute to the business and the users
  • The main success scenario of each use case provides everyone involved with an agreement as to what the system will basically do, also, sometimes more importantly, what it will not do.
  • The extension conditions of each use case provide the requirements analysts a framework for investigating all the little, niggling things that somehow take up 80% of the development time and budget
  • The use case extension scenario fragments provide answers to the many detailed, often tricky business questions
  • The full use case set shows that the investigators have throught through every user’s needs, every goal they have with respect to the system, and every business variant involved
  • how much should be written up front to get the project estimate into a safe place
  • several sticky parts for people using use cases
  • iteration/sprint lengths are so short that it is not practical to implement an entire use case in just one of them.
  • Writing good use cases (or any other requirements) requires thinking, communicating, and thinking again. It is much easier just to write user-story tags on index cards and let the project blow up later
  • We have adopted many of the concepts of Agile development—such as daily build and test, build the smallest piece of functionality that delivers value, etc.—but have retained our up-front work. It’s worked extremely well
Peter Van der Straaten

Alistair.Cockburn.us | A user story is the title of one scenario whereas a use case is ... - 0 views

alistair.cockburn.us/contents+of+multiple+scenarios

agile use case user story uml cockburn debate

shared by Peter Van der Straaten on 25 May 12 - Cached
  • As a … I want… so that…” is a new-fangled user story format. The original XP user story format had no rules, so you could simply highlight any phrase in a use case and call it a user story. Personally, I feel sorry for anyone who has to write “As a… I want… so that…” for 200 user stories. Kind of like being kept after school and having to write “I will not write silly user stories in class” 100 times
  • A use case pretty much by definition contains multiple stories. A use case is a collection of scenarios related to the primary actor’s goal – some scenarios show the actor interacting with the system and the system interacting with other systems so that they succeed with the goal, some show failure. That’s all in the nature of a use case. see Structuring use cases with goals (discussion: Re: Structuring use cases with goals) from 1995. A use case written for this will occupy between half a page for a shortish one to 2 pages for a long one. A user story is a nickname for a single scenario – it contains neither the information content of the scenario nor failure or alternate paths. A user story typically occupies 1/2 to one sentence no matter its size.
  • (p.s. Agile was supposed to reduce bureaucracy and overhead, not add to it. :) Alistair
Peter Van der Straaten

Use Cases for Business Analysts - The New School - 0 views

www.modernanalyst.com/...Use-Cases--The-New-School.aspx

requirements engineering business analysis use case BPMN

shared by Peter Van der Straaten on 22 Jul 21 - No Cached
  • In my experience use cases are very powerful tools - their purpose is show the view from a *user's point of view*. The presented example is already very technical, and specifies a lot of details.
  • May I offer alternatives to the example in the article?A) A few brief classic requirements (for business) & a diagram (BPMN or UML activity diagram) (for the engineers)B) A use case with a lot less details (maybe 4-8 steps) & user interface design & a list of business rules (describing the essence of the details)C) No use case. One single sentence describing the goal & rationale ("As a user I want to have a recovery method when I forget the password because ....") & brief description of the important parts, business rules (no flow details!) & user interface design
  • May I offer other improvements to the "classic" use case in the example?- Instead of a summary, formulate it as a goal (remove redundancy)- Adding how frequently this is done ("Frequency: seldom, max. once per month ... once every few years")- Keep the main flow under 10 points- Remove pre-conditions and post-conditions. Keep it simple.- Integrate the alternative flows into the main flow (if possible, leave away details)
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