The mass behavior of soil and the loadings imparted to civil engineering works by soil masses are strongly influenced by the naturally existing in-situ soil stresses. The determination of in-situ stresses in soil masses is a difficult problem which, in some cases, requires extensive and subtle evaluation if even an approximate determination is to be made. These studies were conducted to review and assess techniques. Methods for estimating in-situ stress from a knowledge of the soil and assumed stress history, as well as direct measurement methods are identified and described. All known methods for determining in-situ stresses are summarized. Recommendations are made for the development of more sophisticated hardware, transfer and development of fabric analysis technology to soil mechanics, and long range development of magnetic resonance techniques.