A further criticism directed at functionalism is that it contains no sense of agency, that individuals are seen as puppets, acting as their role requires. Yet Holmwood states that the most sophisticated forms of functionalism are based on "a highly developed concept of action," and as was explained above, Parsons took as his starting point the individual and their actions. His theory did not however articulate how these actors exercise their agency in opposition to the socialization and inculcation of accepted norms. As has been shown above, Merton addressed this limitation through his concept of deviance, and so it can be seen that functionalism allows for agency. It cannot, however, explain why individuals choose to accept or reject the accepted norms, why and in what circumstances they choose to exercise their agency, and this does remain a considerable limitation of the theory.