Training FFA members for the Food Science and Technology CDE? Need example customer complaint letters for your students to work out on? Look no further. This second packet of customer complaint letters contains three sets of five letters (15 total letters). The letters were created using the guidelines from the National FFA Organization's rules for this practicum. There are keys for each set, but they may be disputed by the instructor based on their interpretation of the letter. Example: quality vs. safety or biological vs. chemical vs. physical.