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Abstract Abstract Particle/grain size and their number density are commonly characterized in two dimensions (2D) from planar optical or SEM micrographs of polished samples. Accurate conversion of such quantities into the three dimensional (3D) values are necessary for prediction of material properties. Several contradicting conversion correlations are available in literature. The main objective of the current works it to verify some of them. For this purpose, geometrical (3D) models of randomly distributed mono-size spheres were constructed and sliced at different planes. The particle count and their size were variated within the same control volume. The statistical investigations of the date suggested a (2D)-to-(3D) conversion factor of 1.152377 ± 0.009427, which is very close to some of earlier works [A. N. Sinha, 1999] On the other hand, a multimedia program was prepared for the course of materials technology and its tests for the students of the second division of production technology in industrial education colleges, including a proposed unit entitled ”Quantitative Estimation of Metals” , And the preparation of measuring tools to determine the effectiveness of this unit, was in the development of computerized testing, and the design of notes for students’ performance of the skills contained in this unit, and analyzed the current content and a list of concepts, skills and the main subsections contained in this decision |