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International standards that define requirements for the development of safety-related systems typically also define required confidence levels for the software tools used to develop those systems. The standards define-to a greater or lesser extent- procedures to classify, validate, certify, or qualify tools. To date, there is no common approach for tool validation, certification, and qualification across safety standards. Different standards attach different levels of importance to tool validation, certification, and qualification, and suggest different approaches to gain confidence in the tools used. With ISO 26262 “Road Vehicles - Functional Safety” on the horizon, automotive software practitioners will need to understand and implement the new software tool classification and qualification requirements laid out in this standard.