What characteristic should requirement possess?

All significant requirements included. No items have been left for future definition.

Incompete if:
– Non functional requirements missing;
– Hidden assumptions;
– Too general statements

Conflicting terminology, contradictory required actions and impossible combinations are notably absent.

Example:
“For Customers, who are exempted from receiving billing reminder notices, ensure that two notices are generated.”

Inconsistency if:
– you don’t generate reminders for exempted customers;

Try to avoid such things as:

-Incorrect statements (copy/paste, mistypes)
-Obsolete requirements
-Gold plating – features that add cost, but not much value
-Technically impossible features

The Requirement should have only one meaning.

Example: “The feature XYZ is optional”

Designer: “The feature is optional, we do not have to implement this”
Customer: “Wow, we will get nice XYZ feature”
Marketing: “ The feature is optional, so we’ll provide it as additional package for extra money”

The Requirement should be measurable.

Wrong examples:

“Application will have 0 bugs.”
“Application will be user friendly.”