The IEC60730-1 standard describes the requirements of “Automatic Electrical Controls for Household and similar use”. It is an international standard for the certification of electronic control units for white goods and household equipment. Examples are firing systems, washing machines and ovens, which have potentially dangerous operating or failure modes. This chapter describes the Application Programmers Interface (API) to the SelfTest Library (STL), which provides the self test functions as required by the IEC60730-1 standard. This chapter is a collection of implementation ideas, which may help to get a system certified. The individual STL Funktions are implemented in an Example program. They can be used with or without modifications or can serve as a discussion basis for our customers.