Globalization of economy, increase in competition and dynamical changes of environment are the reasons that knowledge productions have a considerable share in organizational production. Planning for knowledge products is not an easy task because of intangibility of the nature of knowledge itself. Product classification helps in better planning and decision making because of knowing in advance characteristics of each class. In this paper, the goal is to present a model for classification of knowledge products. To do so, we first present briefly the knowledge production process. Then, knowledge production will be classified through data processing. The type of knowledge production is then expressed in a two- dimensional model; readiness rate of data is one dimension and specification of data processing is another dimension. We then verify similarity of each class by production factors extracted from the literature in our case studies. We further specify four classes of knowledge production for some jobs. Finally, the detailed characteristics and similarities of each class are fully discussed.