The effect of moisture content on the strength and stiffness of southern pine dimension lumber is being investigated. Three visual grades (Select Structural, No. 2 and No. 3) and three sizes (2x4, 2x6 and 2x8) are being conditioned to four target moisture content conditions (10%, 15%, 20% and green). The lumber is being non-destructively evaluated in a flatwise orientation for determination of Modulus of Elasticity (MOE) and is then tested to failure in edgewise bending to evaluate MOE and Modulus of Rupture (MOR). It is anticipated that the relationships found will be used for the development of an analytical model describing the effect of moisture content on the strength and stiffness of visually-graded southern pine dimension lumber. (Author).