After its introduction in the 1979 [[ASHRby Spitler, McQuiston, and Lindsey.<ref name=SML/>
After its introduction in the 1979 [[ASHRAE]] handbook, research continued on increasing the accuracy of the CLTD/CLF method. Research completed in 1984 revealed some factors which were not accounted for in the original publication of the method; these findings were a result of the [[ASHRAE]] research project 359. In 1988 [[ASHRAE]] Research Project 472 worked to correct these oversights with the introduction of a classification system for walls, roofs, and zones. Additionally, a weighting factor database was generated to help correct for previous inaccuracies. Additional research in [[Thermal radiation]] and appliance heat gain with respect to CLTD data was also completed shortly after the original publication of the method. The advancements in each of these areas inspired a revision/compilation effort, and in 1993 the CLTD/CLF/SCL method was succinctly compiled by Spitler, McQuiston, and Lindsey.<ref name=SML/>