Photovoltaic module design draws on knowledge from many disciplines: optical, electronic, mechanical and quality engineering. This course provides attendees with a basic working knowledge of photovoltaic (PV) module design and reliability. A brief summary of the Physics of Failure of Electronic Packages will be presented. The history of PV module field failures will be presented along with a description of how this field experience has been utilized to develop more reliable modules and accelerated stress tests to more rapidly evaluate module performance. The concept of qualification testing will be introduced with a discussion on its usefulness and limitations. Typical module configurations will be presented along with a discussion of the criteria utilized for component selection within these configurations. A number of examples based on commercial module construction will be used to illustrate these points. The long term reliability, degradation rates and lifetime for the present day commercial modules will be discussed.