Science with SIRTF - Some Examples

The Space InfraRed Telescope Facility (SIRTF) is a space-borne, cryogenically-cooled infrared observatory capable of studying objects ranging from our Solar System to the distant reaches of the Universe. SIRTF is the final element in NASA's Great Observatories Program, and an important component of its Origins Program. The intent of this paper is to summarize the most important parameters of the observatory and its scientific instruments and to present three typical examples of scientific areas where SIRTF will have a significant impact. These examples of ``nearby'' targets -- brown dwarf surveys, protostellar disks, and massive young clusters -- have been selected in regard to the main topics of this conference.