Reports on an investigation of computer-based support for developing marketing strategy. First, on the basis of a literature study, the nature of marketing strategy development is clarified. The needs for computer-based support are identified. The status and underlying problems of existing computer-based information systems for developing marketing strategy are then examined. Finally, a mail questionnaire survey on computer-based support for developing marketing strategy is discussed. The major issues addressed in the survey were: managers’ needs for computer-based support in developing marketing strategy; the current provision of computer-based information systems; and the gaps between the identified needs and current provision. It is believed that this was the first study to use a large-scale questionnaire survey to explore these issues. The findings provide important evidence and implications for both researchers and designers of computer-based support for marketing strategy development.