A USEFUL booklet entitled "Quality Control Chart Technique when Manufacturing to a Specification", by B. P. Dudding and W. J. Jennett, has recently been published by the General Electric Co., Ltd., of England (Research Laboratories, G.E.C., Wembley. 2s. 6d.). The booklet describes a more detailed development of the principles discussed in British Standard 600 R (1942), and the major aim of the technique described is to assist production to specification requirements with the elimination of waste labour and material. While the handbook is intended principally as a guide for those concerned with the machine manufacture of articles to dimensional limits, it should be helpful to anyone introducing the technique for use in other types of manufacture. The book is arranged in two parts with appendixes. Part 1 deals with quantitative data and is concerned with the utilization of results of measurement. Part 2, giving qualitative data, is concerned with the utilization of the results of classifying a product into categories as, for example, 'defective' and 'effective'. Suggestions are made with the view of increasing the value of control charts for number defective in those cases where this method has to be adopted or it is preferred on grounds of convenience and/or cost.