← VCE Software Development U3O2

Purpose of a software requirements specification (SRS)

A formal document recording what software must do, so client and developer agree, and used as the basis for design, testing and reference during development.

Part of: VCE Software Development - U3O2 - Analysis and Design — Module 52, QCE Digital Solutions Unit 3 — Real-World Problems and Solution Requirements — Module 93, QCE Digital Solutions Unit 4 — Complex Digital Data Exchange Problems and Solution Requirements — Module 13

Understanding Purpose of a software requirements specification (SRS) in VCE Software Development U3O2

What it does: Linking a test case to a numbered SRS requirement shows the SRS being used as the basis for testing. The developer consults the SRS mid-project to confirm what must be built, which is its reference purpose. The client reviews and agrees to the SRS so both sides have the same expectations of the solution. Design tools such as mock-ups, IPO charts and pseudocode are created to meet the requirements recorded in the SRS. The SRS gives testers a clear list of expected behaviour, so they can check each requirement is met. The SRS is a reference during development. It is written down so developers do not have to rely on memory or guesswork.

Common mistakes: An SRS is an agreement between client and developer, so both should approve and sign it. The line should be 'Signed by: client, developer'. The SRS is the basis for testing. Tests should check that each requirement is met, so the line should be 'Test: check each req is met'.

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Learning
Duo
What is the main purpose of a software requirements specification (SRS)?
To record what the software must do so client and developer share the same understandingTo store the finished source code of the software
Matches
The SRS is a verbal chat that is never written down, so each person remembers requirements their own way.
↓
An SRS is a formal written document. If it is not recorded, the client and developer have no shared, agreed understanding.
Applying
Meanings
Term
Software requirements specification (SRS)
Meaning
A formal document recording what software must do, so client and developer agree, and used as the basis for design, testing and reference during development.
Practice
SRS: Library Loan App
Testing
Gaps
SRS: Software Requirements
Check Answer
Spots
2Client: Mr Ali, canteen mgr
3Signed by: developer only

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Quick Questions

1. What is the main purpose of a software requirements specification (SRS)?
A. To record what the software must do so client and developer share the same understanding ✓
B. To store the finished source code of the software
An SRS is a formal document of requirements. It is not code. It makes sure the client and developer agree on what will be built.
2. Which statement about an SRS is correct?
A. It is written by the developer alone and never shown to the client
B. It acts as an agreement between the client and the developer ✓
The client reviews and agrees to the SRS so both sides have the same expectations of the solution.
3. How does the design stage use the SRS?
A. It is ignored until the software is finished
B. It is the basis for design: designers work from the listed requirements ✓
Design tools such as mock-ups, IPO charts and pseudocode are created to meet the requirements recorded in the SRS.
4. How is an SRS used in testing?
A. Tests are based on the requirements to check the software does what was specified ✓
B. Testers decide for themselves what the software should do
The SRS gives testers a clear list of expected behaviour, so they can check each requirement is met.
5. A developer is unsure whether a feature is part of the project. What should they do?
A. Check the SRS as a reference during development ✓
B. Guess based on memory of an earlier conversation
The SRS is a reference during development. It is written down so developers do not have to rely on memory or guesswork.

Match the Pairs

Software requirements specification (SRS) → A formal document that records what the software must do so developers and clients share the same understanding
Client signs off the SRS → The client and developer agree on what will be built, so the SRS acts as an agreement between them
The SRS is the basis for design and testing: designers and testers use it to check the solution against the requirements → Test case 4 checks requirement FR-3 from the SRS
The SRS is a reference during development: developers return to it to confirm what the software must do → Developer checks SRS: FR-5 - The system must email a receipt
The SRS is a verbal chat that is never written down, so each person remembers requirements their own way. → An SRS is a formal written document. If it is not recorded, the client and developer have no shared, agreed understanding.
Once the SRS is written, it is filed away and not used again during design, testing or development. → The SRS should be used throughout the project as the basis for design and testing and as a reference during development.

Key Term

Software requirements specification (SRS)
A formal document recording what software must do, so client and developer agree, and used as the basis for design, testing and reference during development.

Fill in the Blanks

1. SRS: Software Requirements Specification
Hint: Type the final word in the full name of the SRS document
2. SRS = formal agreement between client and developer
Hint: Type the word for what the client and developer both accept so they share the same understanding
3. The SRS is the basis for design and testing
Hint: Type the word meaning the foundation that design and testing are built on
4. Developers reference the SRS while coding
Hint: Type the verb for how developers use the document during development
5. The SRS records the client's requirements
Hint: Type the word for what the software must do that the document records

Spot the Error

Question 1
A SRS: Canteen Ordering App
B Client: Mr Ali, canteen mgr
C Signed by: developer only
D Role: agreed record of needs
Line C — An SRS is an agreement between client and developer, so both should approve and sign it. The line should be 'Signed by: client, developer'.
Question 2
A SRS: Gym Booking App
B Req 1: Members book classes
C Req 2: Staff view bookings
D Test: ignore Req 1 and Req 2
Line D — The SRS is the basis for testing. Tests should check that each requirement is met, so the line should be 'Test: check each req is met'.
Question 3
A IF unsure what to build
B OPEN the SRS
C READ the requirement
D GUESS what client wants
E END IF
Line D — The SRS is a reference during development. A developer who is unsure should read the requirement and build to match it, not guess.
Question 4
A SRS: an informal verbal chat
B Records: what software must do
C Shared by: client, developer
Line A — An SRS is a formal document, not an informal chat. The line should say it is a formal written record.
Question 5
A Client: Ms Ruiz, bakery owner
B SRS lists: how to code it
C Both agree before design
Line B — An SRS records what the software must do, not how to program it. The line should be 'SRS lists: what to build'.

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