South Africa and Lesotho (SAL) have been inhabited by tool-producing hominins for at least two million years. Most of the information we have about the activities and technological skills of Stone Age people is thanks to the durability of stone tools that not only provide evidence for the presence of humans, but more importantly, encode human technological achievements during more than 99% of the history of our genus. The characteristics of this long and probably continuous history of human occupation of an extensive landmass have been influenced to some extent by changes in demography, socioeconomic factors and environmental variations affected by geology, geomorphology, climate, fauna and flora. The result is an extraordinarily rich and complex record of social and technological changes throughout the Stone Age. Archaeological research over the past century or more has uncovered an ever-increasing variety of data, yet researchers continue to face the challenge of meaningfully describing the variability in stone tool manufacture through time and across space, and investigating the nature of, and reasons for, change. Classification schemes have been concerned with both form and function of stone tools, and have recently begun to pay more attention to the techniques of manufacture as well. The purpose of this short discussion paper and its Appendix is to examine the criteria for classification of stages in the Stone Age sequence, to draw together new information on dated assemblages to improve our knowledge of the technological sequence, and to propose a few adjustments to the nomenclature.