2. INTRODUCTION
The goal of the software requirement definition is to
completely and consistently specifies the technical
requirements for the software product.
Software requirements specification is based on the
system specification high level requirements specified
during initial planning are elaborated.
3. SOFTWARE REQUIREMENTS SPECIFICATION
Format of a Software requirements specification
Section 1: product overview and summary.
Section 2: development , operating and maintenance environments.
Section 3: external interfaces data flow.
Section 4: functional requirements.
Section 5: performance requirements.
Section 6: exception handling.
4. Section 7:early subsets and implementation priorities.
Section 8: foreseeable modification and enhancements.
Section 9: acceptance criteria.
Section 10: design hints and guidelines.
Section 11: cross-reference index.
Section 12: glossary of terms.
5. Section 1 & 2:
The requirements documents present and
overview of product features and summarize the
processing environments for development , operation
and maintenance of the product.
6. Section 3:
Include user displays and report formats , a
summary of user commands and report options ,
data flow diagram and data dictionary.
7. Data flow diagram specify data sources and data
sinks , data stores , transformations to be performed.
Data and flow of data between sources , sinks ,
transformation and stores.
Data source and data sinks are depicted by shaded
rectangles , transformations by ordinary rectangles
and data stores by open ended rectangles.
9. A entities in a data dictionary include the name
of the data item and attributes such as the data
flow diagrams where it is used , it’s purpose
derived from , it’s sub items .
10. Section 4:
Functional requirements are expressed in
relational and state-oriented notation that specific
relationships among inputs, actions and outputs.
11. Section 5:
Performance characteristics such as response
time for various activities , processing time for
various processes , throughput, primary and
secondary memory constraints ,
telecommunications bandwidth
12. Section 6:
Exception handling include the actions to be taken
and messages to be displayed to undesired situations
or events .
Categories of possible exceptions include temporary ,
permanent resources, incorrect inconsistent values
and parameters.
13. Section 7:
Early subsets and implementations priorities for the
system under development . Product to be planned in three
versions:
prototype ,
modest and
enhanced version
The customer may desire delivery of subset capabilities
and the successive versions can increasing level of
capabilities.
14. Section 8:
Foreseeable modifications and enhancements
that may be incorporated in to the product following
initial product release are specified in the product
requirements.
15. Section 9:
Acceptance criteria specify functional and
performance tests that must be performed and
standards to source code internal and external
documentation
16. Section 10:
Software requirements specification contains
design hints and guidelines. The requirements
specification is primary with functional and
performance aspects of a software product.
17. Section 11:
A cross-reference directory should be
provided to index specific paragraph number in
the software requirements specification to specific
paragraphs in the system definition.
18. Section 12:
Software requirements specification
provides definitions of terms that may be
unfamiliar to the customer and product
developers.
19. DESIRABLE PROPERTIES:
There are a number of desirable properties that a
software requirements specification should posses . In
particular , a requirements documents should be:
Correct
Complete
Consistent
Unambiguous
Functional
Verifiable
Traceable
Easily changed
