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Requirement (Functional (Requirements (Imprecision (problems arise if…
Requirement
Functional
Requirements
Complete
include
descriptions
of all facilities required
Consistent
no conflicts
or contradictions in the descriptions
In practice,
impossible
Imprecision
problems arise if requirements are not clearly stated
may be translated differently
Definition
statement of services system should provide
how the system reacts
how the system behaves
Example
Functional requirement dependencies
type of software
expected users
type of system
Requirement MHC-PMS
able to search appointment list
system generate each day
staff members should be uniquely identified
Non-functional
Types
Organizational
Environmental
Operational
Development
External
Ethical
Legislative
Safety/Security
Accounting
Regulatory
Product
Dependability
Security
Efficiency
Space
Performance
Usability
Definition
system properties and constraints
Implementation
may affect the overall
architecture
may generate a number of related
functional requirements
