Abstract
This chapter discusses the nonrelativistic theory, originated in 1951 by Bohm that had its starting point in some considerations which were proposed already by Madelung. Bohm's theory in its original form is an incomplete theory. For the particle's spin, Bohm's original theory has no prescription at all. Arguments by von Neumann against hidden-variables theories do not apply to Bohm's theory. Bohm readily agrees that in his theory one set of hidden variables of a system cannot assign precise values to two noncommuting observables Q and P simultaneously. Because of the finite size of the incident wave packet, the interference phenomena causing wild motion of the scattered particle do not last forever but quiet down as the different wave packets separate from each other. An amusing part of Bohm's theory is that, in principle, it can tell through which slit a particle came as it hits a screen in one of the constructive-interference fringes behind a system of slits.
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