This book is intended as a demonstration that a variety of interesting problems suitable for use in the school mathematics experience of everyperson can be fabricated from available sources. It is intended to be illustrative rather than exhaustive. The problems in the book are intended to be accessible to children by the middle school years. The expository sections may be difficult for middle school students. The underlying idea throughout the book is that of mathematical models. Chapters included in the book are: (1) Uses of Numbers for Description and Identification; (2) Uses of Pairs or Triples of Numbers; (3) The Role of Measures in Application; (4) Formulas as Mathematical Models; and (5) Examples of Problem Collection Themes. A selected bibliography concludes the book. (RH)