Scenarios are the other techniques for requirement analysis. It is way user might utilize the target product to accomplish some objective.

For example, suppose the target product is weight loss planner. One possible scenario describes what happens when the dietitian enters the age, gender, weight, height and other personal data of a patient. The product then prints out sample menus for the patient.

When this scenario is shown to the future user of the target product, the dietitian quickly points out that the menus would be unsuitable for patient with special requirements.

The developer modify the scenario so that the user is asked about special dietary needs before any menus are printed.

The use of scenarios enables users to communicate their needs to the requirements analyst.