A requirement is a need or expectation from a stakeholder that a product, service, or solution must satisfy to be useful. Requirements are often communicated as business rules and should be understood in the context of project goals and quality standards. Requirement management is the process of recording, reviewing, tracking, prioritizing, and deciding on specifications and controlling change and dealing with key parties. It is a continuous process that takes place over the course of a project. A prerequisite is a capability that must be met in order for a project result to be successful.