A thorough understanding of the project on the part of your staff will be reflected in the quality of your field data, so don’t skimp on training your teams. Explain the overarching project, and why their job is important. Give them a reason to feel invested in the result. Introduce them to the tools they’ll be using in the field. If they’re using mobile technology, make sure they are trained by someone who understands it thoroughly. Then, take them through the survey. Run through each question and make sure your data collectors understand what they are expected to deliver.