Software testing tools have proliferated in recent years, and a number of tool classification schemes have been published. In order to provide common reference points for potential purchasers and tool vendors, to ease the comparison of tools with similar functionality, and to assist future research into tool‐supportable software testing, a new classification scheme for testing tools is proposed. The scheme uses six major categories: Test Management, Test Design, Non‐Execution Evaluation, Test Execution. Test Analysis, and Test Quality Evaluation. Other classification schemes are reviewed and compared with the new scheme, and predictions are made concerning future trends in the area of software testing tools. It is hoped that the proposed classification, which is founded on the combination of two current schemes, will provide a basis for discussions that will lead eventually to an international standardisation of tool descriptions.