The Guidance Document on Good In Vitro Methods Practices (GIVIMP) is a project led by the European Commission’s Joint Research Centre. The aim of this document is to provide guidance in order to reduce the uncertainties in cell and tissue-based in vitro method derived predictions by applying all necessary good scientific, technical and quality practices from method development to implementation for regulatory use. The document is targeted towards test method developers and test guideline users and provides best practices for designing guideline in vitro methods, carrying out safety tests and assuring quality and scientific integrity of the resulting data. The GIVIMP is intended to be an important resource that can help to avoid a scientific reproducibility crisis in in vitro toxicological sciences.