guideline that measures what strain your manufacturing process actually applies to the board. The difference between the two defines your safety margin Where to Access You can purchase and download the full IPC/JEDEC-9704A PDF directly from official standards organizations: JEDEC Website (often available as a free preview or for purchase). Are you looking to implement a strain testing plan for a specific process, like ICT or final assembly?
While IPC-9701 sets the standards for reliability testing, IPC-9704 offers specific guidance on how to execute these tests to predict the life of the assembly. ipc-9704 pdf
(Let's stick to the most current and accurate industry definition) . ipc-9704 pdf