With the increasing demand for ornamental stones in Saudi Arabia and the opening of markets to imported products, a sharp competition has begun between domestic and imported granite products.Therefore, it was necessary for the local factories to provide encouraging and reasonable prices for the consumer while maintaining the quality and excellence. Thus, the factor of production is the one that controls the success of the factory or not. It is known that the process of improving productivity includes increasing production without adding any other costs, or reducing unit costs or both together. This research aims to evaluate and assess the factors affecting the production line at the granite factory. It is the first production line where granite slabs are cut and processed in lenghts ranging from two meters to three meters, and vary in width between one meter and two meters; their thickness is constant and equals 2 cm. A mathematical equation has been developed to show the relationship between productivity, in a square meter, for the shift and the factors influencing this productivity, with the aim of evaluating and assessing these factors.