While there is a voluminous literature on proportionality, there is considerably less on reasonableness as a test for judicial review of discretionary determinations. It is argued that reasonableness is concerned with review of the weight and balance accorded by the primary decision-maker to factors that have been or can be deemed relevant in pursuit of a prima facie allowable purpose; that this is borne out through examination of the case law; that insofar as incommensurability is perceived to be a problem in the context of proportionality then this is also true in relation to reasonableness review; that the incommensurability problem is less problematic than is commonly perceived; and that a proper appreciation of reasonableness review has implications for the debate concerning reasonableness and proportionality as tests for judicial review.

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