Software Engineering - Requirements Engineering

Definition of Requirements
1. Descriptons of service and constraints of a system
  1. ranges from high level to detaiiled
Definition of requirements engineering (services and constraints)
1. identifyinng
2. analysing
3. documenting
4. checking
where do requirements come from
1. customers stated needs
2. other stakeholders needs
3. implied needs
4. application domain
5. legal or other regulations
6. The client is not king
  1. must identify real needs
  2. duty to society- legal
User Requirements
1. statements in natural language
2. diagrams of services provided
  1. operational restraints
3. Readers
  1. client managers
  2. system end users
  3. client engineers
  4. contractor managers
  5. system architects
System Requirements
1. structured document
  1. detailed descriptions
    1. functions
    2. services
    3. operational constraints
2. part of contract between client and contractor
3. readers
  1. system end users
  2. client engineers
  3. system architects
  4. software developers
Functional , non Functional and domain Requirements
1. Functional requirements
  1. statements of services provided
  2. how system reacts to inputs
  3. system behaviour in certain situations
2. non functional requirements
  1. system as a whole
    1. constraints
      1. timing
      2. development process
      3. standards
3. Domain requirements
  1. regulation
  2. legislation
  3. legal
Realism,Testability, traceabiility
1. Realistic requirements
  1. budget and time
2. Testable Requirements
  1. contains testable descriptions
3. untestable requirments
  1. language to abstract
4. Traceability
  1. record rationale for requirement
    1. source

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Software Engineering - Requirements Engineering

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	Created by thomaswesterman almost 10 years ago