Submitting a high-quality proposal document requires a combination of effective and efficient processes, committed capable people, careful attention to detail and tight adherence to what the request for proposal (RFP)/invitation to tender (ITT) is asking for. In addition, it has to be well written and presented. It is important to have a checking procedure to ensure the quality of the proposal document is as high as possible. This Practice Note contains quality control questions for some of the most common problems and weaknesses in proposal documents along with suggestions on how to overcome these.