“SIMO” stands for simultaneous-Motion Cycle chart. It is one of micro motion study devised by Gilbreth and it presents graphically the separable steps of each pertinent limb of the operator under study. It is an extremely detailed left and right hand operation chart.
It records simultaneously the different therbligs performed by different parts of the body of one more operators on a common time scale. The movements are recorded against time measured in “Winks” (1 wink= 1/2000 minute). These are recorded by a “Wink Counter” positioned in such a location that it can be seen rotating during filming process.