The origin of stars is one of the principle mysteries of nature. During the last two decades advances in technology have enabled more progress to be made in the quest to understand stellar origins than at any other time in history. The study of star formation has developed into one of the most important branches of mod ern astrophysical research. A large body of observational data and a considerable literat ure now exist concerning this topic and a 1arge community of international astronomers and physicists devote their efforts attempting to decipher the secrets of stellar birth. Yet, the young astronomerjphysicist or more advanced researcher desiring to obtain a basic background in this area of research must sift through a very diverse and sometimes bewildering literature. A literature which includes research in many discip1ines and sub discip1ines of classical astrophysics from stel lar structure to the interstellar medium and encompasses the entire range of the electromagnetic spectrum from radio to gamma rays. Often, the reward of a suc cessfu1 foray through the current literature is the realization that the results can be obsolete and outdated as soon as the ink is dry in the journal or the conference proceeding in which they are published.

Zusammenfassung
Proceedings of the NATO Advanced Study Institute, Agia Pelagia, Crete, Greece, May 27-June 8, 1990

Inhalt
I. Physics 0f Giant Molecular Clouds: Origin, Structure, and Evolution.- Star Forming Giant Molecular Clouds.- The Origin and Evolution of Giant Molecular Clouds.- Cosmic Magnetism and the Basic Physics of the Early Stages of Star Formation.- II. The Physics of Star Formation.- OB Associations and the Fossil Record of Star Formation.- Physical Conditions and Heating/Cooling Processes in High Mass Star Formation Regions.- Newly Formed Massive Stars.- Masers and Star Formation.- The Physical Conditions of Low Mass Star Forming Regions.- The Formation of Low Mass Stars: Observations.- The Formation of Low Mass Stars: Theory.- Numerical Studies of Cloud Collapse.- Binary Star Formation.- Single-Stage Fragmentation and a Modern Theory of Star Formation.- III. Physics of Early Stellar Evolution and Stellar Winds.- Molecular Outflows: Observed Properties.- Herbig-Haro Objects.- The Physics of Disk Winds.- Ionized Winds From Young Stellar Objects.- The Physics of Neutral Winds from Low Mass Young Stellar Objects.- Episodic Phenomena In Early Stellar Evolution.- Properties and Models of T Tauri Stars.- The X-Ray and Radio Properties of Low-Mass Pre-Main Sequence Stars.- Polarization of Light and Models of the Circumstellar Environment of Young Stellar Objects.