In this paper we discuss kinematical issues of the theory of deformations resulting in a small strain accompanied by a moderate rotation. Here, by assuming appropriate measures of rotation and strain which are motivated by a scheme of approximation, we attempt to formulate a theory of small strains and moderate rotations which is consistent and independent of approximation procedures. Within this theory, we establish the characterizations of rigid and homogeneous deformations with reference to a three-dimensional continuous body.
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