A sound knowledge of the status of fish populations is a pre-requisite to informed fisheries and environmental management. Within the Environment Agency, fish population surveys are afforded a high priority, with a large number of sites being-surveyed each year. The data obtained from these surveys are many complex and varied and require substantial statistical analysis, presentation and referral before being used in management decisions. There is a consequent need for. appropriate, software to be available for use by staff throughout the Fisheries Function. The current project was commissioned in order that the software requirements of those tasks associated with fisheries stock assessment be identified, Band that the extent to which existing software fulfils these requirements be assessed.