Abstract
In this article it is proposed that conventional conceptions of validity as applied in the field of Industrial and Organisational Psychological (IOP) assessment tend to emphasise technical aspects that result in an unintended separation of science and practice when implemented. An alternative conception of validity as an action concept is presented. It is noted that such a conception has been implicit in the field for some time and that the ideal of integrating science and practice, which stands so central to Industrial and Organisational (IO) Psychology, is promoted by it.