Ask the Expert

What is the difference between Functional Specification and Design Specification?

When we start to develop the system, documents such as Functional Spec and Design Spec need to be prepared before submission to the programmer(s). What is the different between Functional Spec and Design Spec? I would really appreciate if you could provide me a sample. What other documents should we prepare?

    Requires Free Membership to View

I've always viewed the Functional Specification document as the document that describes the product in terms the users understand. Probably the best way to think about the Functional Specification is that it's the user interface document that you can hand to a Subject Matter Expert (SME) to review and ensure you are meeting the needs of the users. The Design Specification on the other hand is the document that describes the subsystems and the interfaces between those subsystems. It's the developer view of the system. The other documents you need to plan are the Schedule and the Testing Plan. If you have well thought out Functional Specifications and Design Documents, the Scheduling document is moderately easy to do because you've covered all the bases. The Testing will list exactly how you will go about testing the individual features and the final product. Probably the best way to learn about what documentation you need for a good design is to look at Steve McConnell's excellent Rapid Development (Microsoft Press). I've generally followed Steve's advice when planning my own projects. When it comes to Testing Plans, Russ Black's Managing the Testing Process (Microsoft Press) will show you exactly how to proceed.

This was first published in September 2002

There are Comments. Add yours.

 
TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to: