The Full Form of SRDH is System Requirements Definition Handbook.

System requirements are all of the requirements at the system level that describe the functions which the system as a whole should fulfill to satisfy the stakeholder needs and requirements, and are expressed in an appropriate combination of textual statements, views, and non-functional requirements; the latter expressing the levels of safety, security, reliability, etc., that will be necessary.

System requirements play major roles in systems engineering, as they:

• Form the basis of system architecture and design activities.
• Form the basis of system integration and verification activities.
• Act as reference for validation and stakeholder acceptance.
• Provide a means of communication between the various technical staff that interact throughout the project.