Here is a review of Creativity from Contraints: The Psychology of Breakthrough by Patricia Stokes. Stokes is a former advertising graphic artist who became a psychologist following her desire to understand creative behaviour as she had observed it in her profession. In summary, Stokes proposes there are four main constraints to creativity - domain, cognition,variability, talent - and it is how come to understand and articulate these constraints in context that will enable the kind of creative behaviours reuired to  obtain decision making breakthroughs that can be considered creative as opposed to more of the same.