The book consists of numerous lines and sub-routines of BASIC code designed to accomplish specific programming tasks. The solutions presented are cutting edge, in terms of their originality, non-obvious methods, conciseness -- just generally the most effective methods of writing BASIC code possible, and code that accomplishes things you knew were possible, but had no iea how to do. I used the book extensively to help me write an application for a commercial casualty insurance company to automate the rate setting for any given make, model, and year of automobile. At the time (early 80s), a proprietary application was all that was available for such purposes. The application would have been impossible for me to write without this book. At the time I considered Mr. Rosenfelder a genius -- and maybe he is.