How to study ideas in politics and 'influence': a typology

The influence that ideas have (or do not have) in political life is widely regarded as a problematic issue - across many fields of study. Reservations about the possibilities for assessing ideas' influence can be shown to differ, however, in quite revealing ways. Apprehension rests neither on a single, shared reservation, nor even on a core set of reservations. Moreover, many of the reservations lack cogency. A more useful way of addressing the influence-problem' is by employing a typology. This typology would seek to capture the full range of modes in which influence might be exercised. The article therefore proposes one, as a heuristic framework for investigation and analysis, with the intention that it might be applied to the study of real-world' cases.