Evaluation can have several levels. Inputs are resources a program uses in providing services for program participants.
Examples are staff, volunteers, facilities, equipment, curricula and money.
A program uses inputs to support activities . Activities are the services a program provides for its participants. Examples are sheltering homeless families, educating the public about signs of child abuse, delivering meals to home-bound seniors and providing adult mentors for youth. Program activities result in outputs . Outputs are direct products of a program's activities, generally measured in units of service.