This guidance document is intended to support companies through their deployment and implementation of the IOGP Start Work Checks (SWCs). It provides a description of the Start Work Check concept, content, and a comprehensive guide based on IOGP Member Company best practices and experiences that covers the foundational steps needed for successful deployment. Additional implementation tools are available from the IOGP website. In 2018, following rigorous data analysis, IOGP introduced a revised and simplified set of nine Life-Saving Rules to provide workers in our industry with the actions they can take to protect themselves and their colleagues from fatalities (refer to IOGP Report 459 – Life-Saving Rules). With this document, IOGP launches the Start Work Checks (SWC), a human performance tool designed to enable organizations to more effectively implement the Rules in the workplace. The SWCs are recommended for companies who have launched, or are planning to launch, the Life-Saving Rules. The Checks enable frontline workers to confirm that the controls/safeguards designed to prevent fatalities and serious injuries are in place and functioning at the exact location a task is to be done, just prior to starting it.  The Checks are designed to encourage workers to have empowering conversations about what performing a task safely really means, what they need to do, and if those things are present and functioning.