The subject-matter of African politics has always presented a special challenge and a special problem to political scientists, namely to develop a theory which would make sense of a vast, inchoate, and unfamiliar body of material. This problem has become particularly acute in the last year or two. The rapid deterioration of African political parties, a series of military coups, recurrent crises of national unity, and heightened tendencies towards anomic and violent behaviour have not only cast doubt on previous assumptions as to the nature of African political life but have also led to a heightened mood of theoretical uncertainty among political scientists.