The approval process of interlocking systems mandates adherence to the CENELEC standards EN 50126-1 , EN 50126-2 , EN 50128 and EN 50129 across European countries, and these are mirrored by IEC 62278, IEC 62779 amd IEC 62280 elsewhere in the world. Collectively they describe the life cycle process for safety relevant Guided Transport Systems (GTS). This video provides an introduction to the process to be followed in developing software that is compliant with the standards, and explains how automation can help to minimize the associated overheads.