In this issue, IMF Staff Papers begins an occasional section on data problems. We normally publish papers providing primarily analysis of preassembled data. With this special section we break with that tradition and indicate to researchers that we are interested in publishing papers on data construction, collection, and reporting as it applies to topics of research interest. We anticipate the work published in this section will include papers on both post-World War II data and historical data. Topics to be published will likely include data puzzles and