Describes the FAST system, developed by CSIRO for quality control and assurance of fabrics. FAST, or Fabric Assurance by Simple Testing, consists of a series of instruments and test methods which are inexpensive, robust and simple to use. It measures properties which are closely related to the ease of garment making-up and the durability of worsted finishing. FAST-1 gives a direct reading of fabric thickness over a range of loads with micrometre resolution. FAST-2 measures the fabric bending length and its bending rigidity. FAST-3 measures fabric extensibility at low loads as well as its shear rigidity. FAST-4 is a quick test for measuring fabric dimensional stability, including both the relaxation shrinkage and the hygral expansion.