Results of 1,460 replies to a questionnaire on the usefulness of various forecast aids are summarized. Figures are presented showing the forecast aids, charts and diagrams in the order of their indicated usefulness to forecasters. The analysis of the replies shows that differences between services are minor and mainly attributable to differences in requirements and data availability. Differences in experience and training are minor but indicate some small variations. For several forecast aids discrepancies are noted between a particular aid's usefulness and its use.