A recipe for divorce: criticism, contempt, defensiveness and stonewalling.
For over 40 years the psychologist Professor John Gottman has been analysing relationships, both good and bad.
He's followed couples across decades in many psychological studies to see what kinds of behaviours predict whether they would stay together in the long-term or were soon destined for the divorce courts
.Amongst the factors he identified, four have stood out, time and time again. When Gottman sees a couple's communication overrun with these, the chances are they will divorce in an average of around six years from their marriage.