Spin Effects in High Energy Scattering in a Simple Constituent Model

In this paper the author presents an overview of the evolution of proton-proton spin physics over the past quarter century and describes recent work on interpreting high energy polarization effects in a constituent scattering model. INTRODUCTORY REMARKS It is with considerable trepidation that I take the floor to speak to you today about advances in spin physics because I recall having been asked to address this same subject at the Coral Gables Conference some 24 years ago [1]. Clearly, the audience will have every reason to expect me to address the question "what has happened in the intervening years". Indeed, in keeping with the request of the conference organizers, my presentation today will be more of a retrospective one than a detailed technical review. I will provide references to sources where the original data may be found and I will give a brief overview of some of my ongoing work in studying polarization phenomena in a quark-quark scattering model. My focus will be on reflections related to the evolution of spin physics through the window of proton-proton scattering.