This article starts by looking at the now familiar idea of 'New Public
Management' in the light of previous efforts at managerial reform, ar
guing that NPM has proved a fairly durable and consistent agenda. Then
the major criticisms of NPM within and outside the public service are
reviewed, demonstrating the tensions and contradictions among the maj
or criticisms. To endure, NPM must be capable of accommodating differe
nt poles of criticism by modifying its agenda, attempting to identify
the areas where drawbacks in NPM methods are most salient. Finally, so
me future challenges for NPM are discussed: the prospect of outcomes o
utside the conventional distinction of traditional and modern public m
anagement styles; the risk of inappropriate cloning; and quasi-constit
utional issues about the core competencies of public sector agencies.