An updated collection of 12 interactive graphics programs for the Macintosh computer which address differential equations and iteration. The MacMath programs encourage experimentation and vastly increase the number of examples to which a student may be quickly exposed. They are also ideal for exploring applications of differential equations and iteration which, roughly speaking, form the interface between mathematics and the real world. MacMath permits easy investigation of various models, particularly in showing the effects of a change in parameters on ultimate behavior of the system. 164 illustrations.