Appendix A to IPC-2221 provides an overview of designs, limitations and intended uses for IPC-2221 test coupons used for conformance evaluations to IPC-601X printed board performance specifications. This Appendix is recommended to be used in conjunction with the IPC-2221 Gerber Coupon Generator which uses product board design driven user inputs and outputs Gerber files that are intended to be placed on the fabrication panel.