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This paper describes the application of rough set theory to equipment productivity estimate. Rough set theory offers a novel approach both in generation of rules and statistical classification of the equipment productivity data. The approach is based on upper and lower approximations of a set in terms of positive, negative and boundary regions. The information about the equipment productivity is organized in productivity information table. The table contains data about the object of interest characterized in terms of some attributes. The paper is more of an exploratory research to determine how rough set theory can be applicable to specific construction engineering problems.