A three volume report prepared to provide highway engineers a ready reference on overlay design procedures. The first volume summarizes major overlay procedures, documenting their development and the conceptual basis of each and analyzing their sensitivity to required input data. Volume 2 contains the results of a questionnaire concerning use of overlay design procedures by state agencies and appendices for the first volume including the figures for the sensitivity analysis. Volume 3 contains a discussion of the evaluation procedure needed for determining if an overlay is required, the basic requirements of an overlay design procedure, reflection crack concerns, preoverlay repair recommendations, selection of the proper overlay type, and timing of overlay construction.