The assigNmeNt of start aNd eNd times to a set of tasks, subject to certaiNcoNstraiNts. CoNstraiNts are typically either time coNstraiNts (the payload must be iNstalled before the payload bay doors are closed) or resource coNstraiNts (this task requires a small craNe aNd a craNe operator). IN the case where the tasks are programs to ruN coNcurreNtly oN a computer, this is also kNowN as multitaskiNg. (1998-04-25)