Many influences have been drawn upon in this work. Around 1987 Jason Cozens worked with Ivor Catt at Sinclair Research. The work involved looking at ways to program the Catt Spiral. Some of the things looked at were the use of CSP (Hoare, 1985) to implement Fast Fourier Transforms. Catt split the wafer into cells. A cell would be selected on the edge of the wafer and this would probe its neighbouring cells to find one that was working. When a working cell was found this cell would then probe its neighbours. In this way bad cells would be isolated and a chain of good cells would be established.