Identifying design requirements

The design requirements specify the functions that the design must perform and the objectives that the design must meet.

There are two types of requirements: functional requirements and nonfunctional requirements. Functional requirements specify the objectives or functions that a design must meet. Nonfunctional requirements define how the design accomplishes the functional requirements.

Typical functional requirements include the following:

• Business goals
• Business rules
• Legal, regulatory, and compliance requirements
• Application system requirements
• Technical requirements
• Administrative functions

Typical nonfunctional requirements include the following:

• Performance
• Security
• Capacity
• Availability
• Manageability
• Recoverability

While identifying and defining the requirements, separate the functional requirements from the nonfunctional requirements...