software requirement specification
- 1. Topic Interface specification software requirement specification
- 3. Definition Software requirement document is official statement of what the system developers should implement. It also called software requirement specifications or SRS. It includes both user requirement and detailed system requirement specifications. • Software requirement document is official statement of what the system developers should implement. • It also called software requirement specifications or SRS. • It includes both user requirement and detailed system requirement specifications
- 4. Cont.… Sometime user requirements and system requirement are integrated on single description. In other cases user requirements are define in an introduction of system requirement specifications. If requirement are large then system requirement specifications are presented in separate document. • Sometime user requirements and system requirement are integrated on single description. • In other cases user requirements are define in an introduction of system requirement specifications. • If requirement are large then system requirement specifications are presented in separate document
- 5. Cont. Document requirement is essential when outside contactor is developing the system. Agile development method argues that requirement rapidly change so documents are out of date and large effort is wasted. • When the system will be developed by an external contractor. Critical system specification need to be precise and very detailed. • Agile development method argues that requirement rapidly change so documents are out of date and large effort is wasted. • E.g A number of organizations such a US department of defense.
- 6. five steps are includes Customer system managers System engineers System teste engineers System maintenance engineers
- 7. steps System customer: specify the requirement and read them to check that they meet their needs. Customer specify change to the requirement . Managers: use the requirements document to plan a bid for the system and to plan the system development process. System engineers : use the requirements to understand what system to be developed. System customer: specify the requirement and read them to check that they meet their needs. Customer specify change to the requirement . Managers: use the requirements document to plan a bid for the system and to plan the system development process. System engineers : use the requirements to understand what system to be developed.
- 8. Cont. System teste engineers: use the requirement to develop validation tests for the system. System maintenance engineers : use the requirements to understand the system and the relationship between its parts. . System teste engineers: use the requirement to develop validation tests for the system. System maintenance engineers : use the requirements to understand the system and the relationship between its parts. .
- 9. Interface specification Interface A inter face is a intersection between system and environment. Interface =system /environment Specification A Specification is a agreement Between the produce of the services Consumer of that services Interface A inter face is a intersection between system and environment. Interface =system /environment Specification A Specification is a agreement Between the produce of the services Consumer of that services
- 10. Interface specification Large system era decomposed into a subsystem with well-defined interface between these sub system. Three types of interface specification Procedural interface Data structures Data representation • Large system are decomposed into a subsystem with well-defined interface between these sub system. Four types of interface specification 1) Procedural interface 2) Data structures 3) Data representation 4) Message passing interface
- 11. Procedural interface Procedural interface Is used for calling the existing programs by the new programs. These interface are sometime called application programing interface (APLs) Procedural interface Provide data passnig from one sub system to another system. Procedural interface Is used for calling the existing programs by the new programs. These interface are sometime called application programing interface (APLs) Procedural interface Provide data passing from one sub system to another system.
- 12. Data representation Data representation Ordering of the bits to match with the existing system Most common in real time and embedded system. Message passing interface Sub system requesting service from other sub systems Data representation Ordering of the bits to match with the existing system Most common in real time and embedded system. Message passing interface Sub system requesting service from other sub systems
- 13. Thanks