Establishing Requirements

Establishing Requirements

1. What, how and why?

   • Establishing requirements...
     • Goals
       • Understand users, activities and the context
       • Produce stable requirements
     • Activities
       • Data gathering
       • Data analysis and interpretation
       • Requirements extraction
       • Iteration
     • Importance
       • Avoids...
         • Insufficient user communication
         • Insufficient analysis
         • Poor specifications

2. What are requirements?

   • Functional
     • What the system should do
     • Data requirements
   • Environmental
     • Physical
     • Social
     • Organizational
     • Technical
   • Non-functional
     • How the system should do it

3. Data gathering for requirements

   • Interviews
   • Questionnaires
   • Observations
     • Direct
     • Indirect
   • Studying documentation
   • Researching similar products
   • Contextual inquiry
     • Context
     • Partnership
     • Interpretation
     • Focus principle

4. Data analysis, interpretation and presentation

   • Use of
     • Documents
     • Diagrams
     • Formal notations
   • Brainstorming for innovation
     • Include wide range of disciplines
     • Allow silly ideas
     • Use idea catalysts
     • Keep records
     • Sharpen the focus
     • Make the session fun

5. Task description

   • Scenarios
     • Describes tasks in the form of stories
     • Easy to relate to
   • Use cases
     • Actors, use cases and systems
     • User-system interaction
     • Graphical representation
   • Essential use cases
     • Abstractions from scenarios
     • Division between user and system responsibilities

6. Task analysis

   • Hierarchical
     • Pros
       • Objective comparison with alternative designs
       • Understand the interaction
       • Design reuse
     • Cons
       • Real tasks are very complex
       • Kinds of tasks able to be modeled are limited

7. Pedro Fernando Villezca Garza A01282613

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