While the initial HERMES program will focus on the spin-structure function
measurements of the nucleons, there is a rich program of physics
experiments to be carried out by the HERMES Collaboration. Because the
HERMES detector also has pion identification capability, flavor-tagged
structure functions can be measured. Also, the -dependence of the
asymmetry will give constraints on the spin-fraction carried by the orbital
angular momentum of the quarks. Issues of color transparency in
production, which were raised in E665 at Fermilab, will be addressed in the
HERMES experiment. The process of hadronization will also be investigated
in the nucleon and nuclei. The experiment to measure the asymmetry in
production will require a laser-driven H/D target and a RICH
detector. In addition,
detectors and recoil detectors will be
implemented to investigate "back-angle'' tagging of structure functions.
It is likely that a gas jet target as well as new target chambers and
improved beam polarimetry will be necessary.