This text describes the Transputer Development System (TDS), an integrated programming environment developed by INMOS to allow programming of transputer networks in OCCAM. It offers an introduction briefly describing the transputer architecture and the OCCAM programming model. TDS is covered in two sections - the user guide, which describes how to use the TDS, and the reference manual, which gives a detailed description of the TDS programming environment, its utilities and the libraries provided with the system.