Reaction Timer, a simple program for the BBC B by A. Moulder of Rainham, Essex will help you sharpen those reflexes so necessary for playing the latest computer games or for making the brilliant catch which might put the West Indies out of a Test Match for good.

After a variable time, a question mark appears at a random position on the monitor display. Hit the RETURN key as fast as you can and, after three attempts, your average time will be given in centiseconds, together with your rating.