The paper shows the need for a selection and testing machine in the light of recent developments in the automatic assembly of components on to printed-wiring boards. The advantages of a programmed machine are given and the flexibility and simplicity obtained are illustrated.The general operation of the machine is outlined. Examples of the method of coding and the technique of programming on to punched-paper tape are included. The build-up of the electronic control from a number of relatively simple basic circuits is shown.Finally, the range of components handled, details of the test bridges, and the overall speed and reliability are given.