Alternative theories of the firms diverge from the traditional theories of the firms and criticise the marginalist principles. So whenever you are talking about any Alternative theories of the firms, as in Baumol, Williamson, Marris, Cyert and March models etc., these models explain different factors such as institution economics, behavioural economics etc. So, to answer your query, indeed, we can explain behavioural theory as a factor, when we are dealing with alternative theories of the firms.