A behavioural disposition is a disposition of a System to behave in a certain way.
Complex behaviours are expressions of complex dispositions; complex dispositions can encompass patterns of concrete actions (actual ones as well as potential, i.e. empirically possible ones), strategies, habits and values.
Behavioural dispositions are the product of Evolution and can get selected on the population level, e.g. irrational behaviour in stochastic environments or memes in cultural evolution.