We outline an introduction to quantum mechanics based on the sum-over-paths method originated
by Richard P. Feynman. Students use software with a graphics interface to model sums associated
with multiple paths for photons and electrons, leading to the concepts of electron wavefunction, the
propagator, bound states, and stationary states. Material in the first portion of this outline has been
tried with an audience of high-school science teachers. These students were enthusiastic about the
treatment, and we feel that it has promise for the education of physicists and other scientists, as
well as for distribution to a wider audience.