To investigate the process of grain scale sub-division, an interstitial free (117) steel, of initial grain size 120mum, was deformed by cold rolling to reductions of up to 50%. Grain sub-division was investigated both using back-scattered channelling contrast images, and from orientation measurements taken using the electron back scatter pattern (EBSP) technique. Initial examination of the EBSP data based on the variation along line scans in the rolling and normal directions (RD, ND) suggested that the deformation of the grains could be classified into a few characteristic patterns. A more detailed examination of the sub-division pattern was carried out by constructing maps of deviation to the grain mean orientation. This analysis shows that in many, but not all cases, large grain rotations are found in wide regions near grain boundaries and/or triple junctions. In only a limited number of grains, a pattern of macroscopic (deformation) banding may also be observed.