I am creating this thread here for second time.First time there was very little interest to share knowledge. This thread is entirely for new and experienced Business Analyst,Business System Analyst and System analyst for adding point to their learning as well as experience curve. Welcome all BA/BSA and SA to this forum: Let's start with something easier: There are three levels of requirements. a. Business Requirements - High level objectives of the project which are recorded in the Vision and Scope Document b. User Requirements - Task and facilities available to the end user recorded in the Use Cases. c. Functional Requirements - Detailed listing out of each behavior that the software must exhibit. This along with the quality attributes and other non-functional requirements is documented in the Software Requirements Specification (SRS).