Having elected several years ago to devote my spare time to research and technical writing on the subject of concrete, I am at times disconcerted when I have occasion to reread some of my own early statements. I find consolation, however, when I read a technical article or research report in which the author rediscovers, and innocently presents as new, something which was well know to concrete technologists and users many years earlier. There is little excuse for this now that excellent classified indexes are available in many technical reference libraries. Perhaps it is an exaggeration to say that there is "nothing new under the sun" in the cement and concrete field, but developments during recent decades have been relatively insignificant, being largely confined to extraneous matters, based on generally accepted assumptions. There are many fundamental research problems which have been relegated to the "maybe someday" basket. The related problems of shrinkage and cracking are examples which come readily to mind. Although there is unquestionably some lack of communication in the research field, the real culprits are the designers and concrete producers or users who fail to familiarize themselves with the wealth of technical information already available: when they run into trouble they clamor for research on subjects which have already been thoroughly researched. For example, a feeling of inevitability exists in regard to shrinkage and cracking, possibly dating back to such past statements on the properties of concrete as the following from an early edition of the Bureau of Reclamation Concrete Manual: "Concrete shrinks as it dries, expands and contracts with temperature changes, and being low in tensile strength, cracks easily when subjected to tensile stress." How many totally unnecessary surveys and investigations have been addressed to aspects of the problem which have already been dealt with and published. Research should seek to overcome the basic problem of shrinkage rather than continue to study the causes for cracking which have been widely documented for as many years. There may also be some secondary research problems related to cracking: local materials that are suspect with regard to alkali-aggregate reaction or aggregates that may be subject to moisture movement. But there can be no excuse for continued broad efforts to explore the concrete cracking syndrome.