Quality Software

There are two important definitions of quality software:
1) IT’s view of quality software means meeting requirements.
2) User’s of software view of quality software means fit for use.

Meeting requirements is IT’s definition of quality; it means that the person building the software builds it in accordance with requirements.
The fit for use definition is a user’s definition of software quality; it means that the software produced by IT meets the user’s need regardless of the software requirements.

In most IT groups, there are two gaps, the different views of software quality between the user and IT.
The first gap is the IT gap. It is the gap between what is specified to be delivered, meaning the documented requirements and internal IT standards, and what is actually built.
The second gap is between what IT actually delivers compared to what the user wants.

(taken from somewhere on net)