Functions Modeling Change by Andrew M. Gleason, Deborah Hughes-Hallett (2003, Paperback)

From the Calculus Consortium based at Harvard University, Functions Modeling Change, 2^nd Edition prepares readers for the study of calculus, presenting families of functions as models for change.  These materials stress conceptual understanding and multiple ways of representing mathematical ideas.  The focus throughout is on those topics that are essential to the study of calculus and these topics are treated in depth.