Types of Requirements Functional Requirements define what functions need to be done to accomplish the mission objectives ■ Performance Requirements define how well the systems needs to perform the functions ■ Constraints are requirements that can not be traded off with respect to cost,schedule,or performance Interface Requirements Environment Requirements ■ Other-illities requirements includes:human factors,reliability requirements,safety requirements CLGO System Engineering by J.J.Gao 10+ - System Engineering by J. J. Gao 10 Types of Requirements Functional Requirements define what functions need to be done to accomplish the mission objectives Performance Requirements define how well the systems needs to perform the functions Constraints are requirements that can not be traded off with respect to cost, schedule, or performance Interface Requirements Environment Requirements Other-illities requirements includes: human factors, reliability requirements, safety requirements