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The fewbody problem is one of the most fundamental unsolved problems in physics, and arises from the fact that the Schrödinger equation is not analytically soluble for more than two mutually interacting particles. As a result, theory must resort to approximations, the validity of which are determined by comparison with experiment. There has been much work done on the threebody problem, and in many cases, theory and experiment agree very well. Recent advancements in experimental techniques and computing capabilities now allow for the study of more complicated collision systems, such as fourbody collisions. The simplest fourbody problem is a charged particle collision with a helium atom, in which both atomic electrons change state. This type of collision can result in many different outcomes, such as double excitation, excitationionization, double ionization, transferexcitation, transferionization, and double charge transfer. The two collision systems of electron impact excitationionization and proton impact transferexcitation will be discussed, with an emphasis on the importance of projectiletarget and projectileion interactions, as well as electron correlation. Host: James Colgan 