People skills in "soft skills" and interpersonal skills of employees. In organizations, improving people skills became a specialized role of the corporate trainer. By the mid-1930s, Dale Carnegie popularized people skills in "How to Win Friends and Influence People" and "How to Stop Worrying and Start Living" worldwide. In the 1960s, US schools introduced people-skills topics and methods—often as a way to promote better self-esteem, communication and social interaction. These encompassed psychologist Thomas Gordon's "Effectiveness Training" variations as well as many other training programs. The first documented use of the phrase "people skills" was around 1970. The SCANS report states that business,
What Engineers Know and How They Know It What Engineers Know and How They Know It What Engineers Know and How they Know It: Analytical Studies from Aeronautical History (The Johns Hopkins University Press, 1990) () is a historical reflection on engineering practice in US aeronautics from 1908 to 1953 written by an accomplished practitioner and instructor. This period represents the dawn of aviation which was fraught with uncertainties and numerous paths to many possible worlds. The book captures two main conclusions from this period. The first order conclusion of this book is about "what engineers know." Five case studies from the history of aeronautical engineering are used