WOMBATS cab be institutional/systemic or accidental.  The institutional WOMBATS inhabit the area under the normal distribution curve.  These are within the normal variation of process - the "this is how we've always done it' territory.  To the left and right of the normal distribution curve, are the accidental or extreme WOMBATS.  These are the ones that are exceptionally bad or exceptionally good ways of working.   The bad ones require quick elimination, while the good ones need capturing, understanding and interaction with those under the normal distribution curve.