[en] A task analysis of nuclear power plant control room crews was performed by General Physics Corporation and BioTechnology, Inc., for the Office of Nuclear Regulatory Research. The task analysis methodology used in the project is discussed and compared to traditional task analysis and job analysis methods. The objective of the project was to conduct a crew task analysis that would provide data for evaluating six areas: (1) human engineering design of control rooms and retrofitting of current control rooms; (2) the numbers and types of control room operators needed with requisite skills and knowledge; (3) operator qualification and training requirements; (4) normal, off-normal, and emergency operating procedures; (5) job performance aids; and (6) communications. The data collection approach focused on a generic structural framework for assembling the multitude of task data that were observed. Control room crew task data were observed and recorded within the context of an operating sequence. The data collection was conducted at eight power plant sites (in simulators and/or in control rooms) by teams comprising human factors and operations personnel. Plants were sampled according to NSSS vendor, vintage, simulator availability, architect-engineer, and control room configuration. The results of the data collection effort were compiled in a computerized task database. Six demonstrations for suitability analysis were subsequently conducted in each of the above areas and are described in this report. Volume 1 details the Project Approach and Methodology. Volume 2 provides the Data Results including a description of the computerized task analysis data format. Volumes 3 and 4 present the Task Data Forms that resulted from the project and are available on a computerized data-base management system