Currently I compare the changed values, and if mary and fred have the same permissions, I let mary see the changes that fred made that she did not, and say 'wou

Currently I compare the changed values, and if mary and fred have the same permissions, I let mary see the changes that fred made that she did not, and say 'would you just like to change this row (phone)'. I'm working with a small data set, and also I keep history, but I change the value of a hidden form element (mine is a web app) when <input name="phone" onChange="THIS()"> THIS is invoked, for example. and if mary never changed address, but the value in address is different than the value that she passes in, it gives an error condition and lets Mary figure it out.