“There are no hard-and-fast rules for judging whether a consultant or an agency is a better fit for any given project. Aside from time, money, and required skills, there are a variety of other factors to consider—for example, the stage of the product development process at which you’re asked to come in, whether an engagement is one of strategic guidance or tactical execution, and the maturity and capacity of the client’s team.” (Whitney Hess – UXmatters)