The Louisville Combustibility Test (LCT) is a simple method for the measurement of the rate of burn of cigarette paper which has been used, in a variety of formats, for over 50 years by paper manufacturers. Over the last two years there has been a renewed interest in the test as a means of classifying wrappers and cigarette papers used by roll-your-own smokers and for this reason the method has been further developed and standardised by the CORESTA Roll-Your-Own Task Force. This paper describes the development and present status of the test. The test, in brief, takes a 60 mm length of cigarette paper, rolls it around a needle and measures the smoulder rate in seconds over a marked width of 15 mm. LCT values for a range of cigarette paper wrappers are given together with the variability of the results both within and between laboratories. The major interest in the Louisville Combustibility Test lies in its ability to classify wrappers and cigarette papers according to the smoke yield of the subsequent roll your own product. Such comparative tests between cigarette paper parameters and smoke yields carried out by the CORESTA RYO Task Force are given and the results discussed.