The steps involved in designing the cross sectional dimensions of a prismatic beam, knowing the material from which it is made, as well as the loading and support conditions are: The steps involved in designing the cross sectional dimensions of a prismatic beam, knowing the material from which it is made, as well as the loading and support conditions are: Draw shear and moment diagrams, assume the allowable normal stress controls and calculate the required dimension(s), check the shear stress Draw shear and moment diagrams, assume the allowable shear stress controls and calculate the required dimension(s), check the normal stress Draw shear and moment diagrams, assume the allowable normal stress controls and calculate the required dimension(s) Draw shear and moment diagrams, assume the allowable shear stress controls and calculate the required dimension(s)