This article outlines the Results-Based Evaluation (RBE) framework proposed for the ex-post assessment of the National Environmental Management Strategies (NEMS) in 12 small-island developing states (SIDS) in the South Pacific. It gives an overview of the methods and basis of developing an evaluation framework in the context of SIDS in the region.…

Discusses a technique for estimating sample size that does not require an a priori definition of desired precision. Presents five modifications that make the method easier to use and reduce the probability of estimating a larger sample size than necessary. The technique can guide the design of environmental sampling programs. (Contains 31…

This discussion article addresses the nature of models used in hydrology. It proposes a minimalist classification of models into two categories: models built on data from observations of the processes involved, and those for which there are no observation data on any of these processes, at the scale of interest. (LZ)

Dozens of countries have decentralized at least part of their natural resource policies over the last two decades. Despite the length of time that these policy experiments have been in force, there is little agreement about their effectiveness. We argue that part of this ambivalence stems from three limitations of extant studies, suggesting that…

Presents a general framework for designing sampling programs that ensure cost effectiveness, and managed errors kept within known and acceptable limits. (LZ)