Most couples counselling uses a value-based system which is explored by the couple and their counsellor. Typically, this will try to establish what the shared values of the people concerned are because by focussing on those, it becomes possible to engage in conflict resolution. Other principles involved rely on an understanding of so-called maladaptive patterns, whereby self-destructive behaviours place the relationship under strain, for example. This might include psychological explanations of behaviour, such as attachment theory and theories concerning egotistical practices. Active listening is another concept that is usually utilised in marriage counselling.