Needs assessment plays an important role in training and human performance improvement efforts, but the literature contains little research on this topic. This study extended previous research on the Performance Analysis for Training (PAT) model of needs assessment by examining its implementation to determine environmental and occupational health and safety training needs in a government agency. Using case study methodology and the lens of responsive evaluation, this study resulted in three perspectives about the actual needs assessment implementation. The three professionals' distinct areas of expertise (evaluation, health and safety, human resource development) informed the case in unique ways. The results can be used to improve the PAT model and also to give human resource development and performance improvement professionals insights about nuances of needs assessment practice. (Contains 1 figure and 2 tables.)