The first process defines the functional requirements on the function while the safety one specifies redundant sub-functions (realizing together the function) allowing to ensure a continuous service under failure.
The designer must therefore seek the path that resolves only one functional requirement on each level of the design hierarchy.
Beside the requirements on the above functional constraints (hard constraints), the user can also specify soft constraints, such as "The total response time of the composite Web service should not exceed 30 s".
Before moving ahead, one should go for some abstract designs based on functional requirements and discuss these with the team.
The use of the Specific Section structure to deal with the variabilities is useful for describing variabilities on functional requirements, like in the template of Gomma (2004), and non-functional requirements, as used in the template of Nguyen (2009).
Besides elicitation of and decisions on functional requirements (what the technology should be able to do) and design requirements (what interfaces should look like and how they should be structured to support tasks), the dynamic of our approach resulted in insight regarding information needs, task perception, and implementation.
Instead, we will focus on functional requirements between the system and its users that are affected by introducing pseudonymity and non-functional requirements that are implied by pseudonymization concepts.
So the question of whether performance differences are quality differences may depend on circumstantial preferences but preferences based on functional requirements, not taste.
"We would support implementation provided it was focused on functional requirements and the process for choosing technologies was fair, open and transparent," said Andrew Moss, the Microsoft director of technical policy for the new media platforms division.
Analysis modeling focuses on functional requirements and postpone implementation specific issues until subsequent design activities are undertaken.
