This supplementary text material is meant to suggest ways in which the computer can increase students' intuitive understanding of fields and waves. The first way allows the student to produce a number of examples of the physics discussed in the text. For example, more complicated field and potential maps, or intensity patterns, can be drawn from more complicated wave source patterns. The second allows the student to compare the idealized physical situations from the course text to more realistic physical situations. Examples are: (1) computer calculations of waves in dispersive media, or (2) interference patterns from radio and television antenna patterns. Most of the areas currently being taught in second semester introductory physics courses are included, as well as, some subjects which are not always covered in such courses. The six major sections are: (1) static electric fields, (2) static magnetic fields, (3) circuit theory, (4) geometrical optics, (5) wave interference, and (6) wave propagation. The material was produced by Project COEXIST, a National Science Foundation sponsored project at Dartmouth College to investigate the use of computers in introductory engineering, mathematics and physics courses. (Author/TS)