In this thesis an evaluation is made of the results of approximately 1200 designs for one-way and two-way slabs meeting the requ1rements of the A.C.I. Code (1). The parameters have been chosen to cover a wide range of practical design conditions. The data resulting from these designs have been plotted using dimensionless parameters evaluated from a dimensional analysis approach. Curves fitting the data proved to be continuous over the working range, so equations for the curves were developed. Data from the original designs were compared with results computed from the developed equations. In a few cases maximum deviations of less than three percent were found. The average deviation for all designs was found to be less than one percent.