when I first got involved with GPR and its uses in archaeology in the late 1980s, it was a very lonely world, with only a few collaborators with whom I could compare ideas, share data, and work jointly in developing processing and in• terpretation methods. I was fortunate to have had Dean Goodman and Jeff Lucius as friends and collaborators, and along with a few others in the United States and western Europe, there was the beginning of a small com• munity of GPR practitioners. Today there are many competing GPR system manufacturers and thousands of users on every continent; the community keeps get• ting larger and more dynamic with each passing year. It seems at times that the GPR community today is so vast and diverse that it is difficult to keep up with all the new advances. Looking back, I remember producing a "wish list" in 1996 with Dean Goodman, where we listed GPR advances we expected or hoped would occur in the next 10 years (Conyers and Goodman 1997). When he and I reviewed that list just four years later, we were as• tounded that almost everything on that list had been accomplished, and new advances were progressing at a rate even faster than we could have imagined. Collection and processing of GPR data is now fast, accurate, and very sophisticated, with huge amounts of data collected over areas that are vastly larger than we thought was possible in the 1990s. Many of the standard GPR images,includ• ing reflection profiles and amplitude slices, are now com• monly produced by all GPR scientists and have become commonplace throughout the industry. However, there still seems to be a good deal of confusion and debate about what all those images reveal about what is in the ground. That is the subject of this book.

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