There are not many branches of science where amateurs regularly contribute significant observations or discoveries. Astronomy is somewhat different, not least because the number of professional astronomers is relatively small and observing time at the major observatories is very limited. This has left some areas of astronomy where amateurs can contribute. In the past measuring the orientation and separation of binary stars and the identification and characterisation of new binary stars were identified as two examples of "useful" amateur projects. Most amateur astronomers dream of making a discovery that will appear in all the standard catalogues. This book shows how to make your dreams come true.