Training Within Industry
The Training Within Industry (TWI) service was created by the United States Department of War, running from 1940 to 1945 within the War Manpower Commission. The purpose was to provide consulting services to war-related industries whose personnel were being conscripted into the US Army at the same time the War Department was issuing orders for additional matériel. It was apparent that the shortage of trained and skilled personnel at precisely the time they were needed most would impose a hardship on those industries, and that only improved methods of job training would address the shortfall . By the end of World War II, over 1.6 million workers in over 16,500 plants had received a certification.
The four basic training programs (10-hour sessions) developed by TWI were developed by experts on loan from private industry. Because of the intensity of the situation, a large number of experimental methods were tried and discarded. This resulted in a distilled, concentrated set of programs. Each program had introductory programs called "Appreciation Sessions" that were used to sell the programs to top management and introduce the programs to middle management of a company. Each program also had 'Train-the-Trainer' programs and handbooks called "Institute Conductor's Manual" for the master trainers. The TWI Service also developed a number of "Staff Only" training programs to support staff development and to improve the implementation success.
The TWI trainers had to be invited to a factory in order to present their material. In order to market the service, they developed the Five Needs of the Supervisor: every supervisor needs to have Knowledge of the Work, Knowledge of Responsibility, Skill in Instructing, Skill in Improving Methods, and Skill in Leading. Each program was based on Charles Allen's 4-point method of Preparation, Presentation, Application, and Testing.
The 10-hour Sessions were:
- Job Instruction (JI) - a course that taught trainers (supervisors and experienced workers) to train inexperienced workers faster. The instructors were taught to break down jobs into closely defined steps, show the procedures while explaining the key points and the reasons for the key points, then watch the student attempt under close coaching, and finally to gradually wean the student from the coaching. The course emphasized the credo, "If the worker hasn't learned, the instructor hasn't taught". At the request of enterprises outside of manufacturing, variations to the JI program were developed for hospitals, office and farms.
- Job Methods (JM) - a course that taught workers to objectively evaluate the efficiency of their jobs and to methodically evaluate and suggest improvements. The course also worked with a job breakdown, but students were taught to analyze each step and determine if there were sufficient reason to continue to do it in that way by asking a series of pointed questions. If they determined some step could be done better by eliminating, combining, rearranging, or simplifying, they were to develop and apply the new method by selling it to the "boss" and co-workers, obtaining approval based on safety, quality, quantity, and cost, standardizing the new method, and giving credit.
- Job Relations (JR) - a course that taught supervisors to deal with workers effectively and fairly. It emphasized the lesson, "People Must Be Treated As Individuals".
- Program Development (PD) - the meta-course that taught those with responsibility for the training function to assist the line organization in solving production problems through training.
There was also a short-lived course that taught union personnel (UJR) to work effectively with management.
Additional Training Programs
Internal training programs were; "Management Contact Manual" (1944) - a formal training course on how to sell the TWI programs to management, "How to get Continuing Results from TWI Programs in a Plant" (1944) - this training program was the out-growth of two years of practical experimentation and experience on what it took to have a successful implementation of TWI.
- Job Safety (JS) - While the US TWI Service chose to not develop a JS program, stating that safety was part of every job, Canada led the way with the first variant that was closely modeled on the JI program. This program was offered to England, which declined and developed a JS program that focused on discovery of risk and resolution. Copies of the British programs were circulated in Japan starting about 1948. 
- Problem Solving (PS) - There are two different programs using similar names. The TWI Foundation released their PS program in 1946 and follows the standard J program format. TWI, Inc. released their program in 1955 and is a much more comprehensive program that revolves around using the JI, JR and JM programs for problem solving. 
- Discussion Leading (DL) - This is an early work in developing what is now recognized as facilitation skills. TWIF also produced a variant of this program called Conference Leading.
Expansion of TWI to other nations
There were several groups that had a major impact in the expansion of the TWI programs around the world - US State Department, US Army, British Ministry of Labour, International Labor Organization (ILO) and Standard Oil.  In 1944, the British Ministry of Labour sent Frank Perkins to the US to evaluate the TWI programs.  In the summer of 1944, Perkins returned to England to establish a similar program. The British Ministry of Labour actively promoted the TWI programs, listing 65 countries in addition to the US and England where TWI was know to be in use as of 1959.  Expansion into Europe was led by Standard Oil, which led the translation efforts of the manuals into native languages. Some European TWI activity was done under the Marshall Plan by "Visiting Experts" (VE), with limited success. It was the later work by the ILO using the Standard Oil translations and re-translation efforts that established the TWI programs in Europe. The ILO TWI training program in Bangalore India has the distinction of training the first Japanese about 1947. 
Relationship to Lean
Although the TWI program funding for application of the programs in the USA by the government ended in 1945, The US government did fund the introduction to the war-torn nations of Europe and Asia. Several private groups continued to provide TWI in the US and abroad. Channing Dooley, Walter Dietz, Mike Kane and Bill Conover (collectively known as "the Four Horsemen") continued the development of the 'J' programs by establishing the TWI Foundation. This group was responsible for continuing the spread of TWI throughout Europe and Asia. The Director of one of the district offices established TWI, Inc., and was hired by the US Government to provide TWI training in Japan. It was especially well received in Japan, where TWI formed the basis of the kaizen culture in industry. Kaizen, known by such names as Quality Circles in the West, was successfully harnessed by Toyota Motor Corporation in conjunction with the Lean or Just In Time principles of Taiichi Ohno. In the Foreword to Dinero's book "Training Within Industry", John Shook relates a story in which a Toyota trainer brought out an old copy of a TWI service manual to prove to him that American workers at NUMMI could be taught using the "Japanese" methods used at Toyota. Thus, TWI was the forerunner of what is today regarded as a Japanese creation.
TWI had a direct impact on the development and use of kaizen and Standard Work at Toyota. These fundamental elements are embedded within the functional system at Toyota and Job Instruction is taught and used within Toyota today. The kaizen methodology is a direct descendant of Job Methods, and most likely Job Relations had an impact on the development and function of the Team and Group Leader structure in Toyota.
Many of the points above should look familiar to students of W. Edwards Deming: the PDCA style of the training programs, the JI litany about failure being on the shoulders of the instructor, and even the JI and JM methods themselves. Deming lectures frequently included statements similar to the JR slogan, "People Must Be Treated As Individuals."
Why it disappeared from the United States
More than 100 leading companies in the US supported the TWI Foundation following the war as they continued to develop these programs. TWI Conferences were held until 1952.  The principles of the TWI programs found their way into general training processes across the nation.  The original Job Instruction program was part of the business program at the University of Chicago until 1967.  A few consultants offered versions of the programs into the 1980s.
One theory for the disappearance of TWI within the U.S. after the war is the simple fact that North American industry faced little serious competition in 1945. With no competition to an efficient industry, few saw the need to continue to improve. At the same time, foreign industries had been decimated. The defeated countries needed to establish new industry but to reject the old culture. For that purpose, TWI trainers were brought to Europe by the occupying forces there, and to Japan by MacArthur during the occupation. 
Another theory is that after the war, everyone went back to "business as usual". The workforce returning from war moved back to their previous jobs without any idea of the new culture. Most of the workforce trained through TWI went back to their previous jobs. This caused TWI culture to fade away.
- Toyota Production System
- General McArthur's Occupation of Japan
- Occupied Japan / Occupation of Japan
- Dinero, Donald (2005). Training Within Industry: The Foundation of Lean. Portland, OR: Productivity Press. ISBN 9781563273070.
- (Reference: US National Archive SCAP collection)
- (Reference: US National Archive SCAP collection; US National Archive TWIF Collection; Private collection of Mark Warren)
- (Reference: US National Archives ; British National Archives; ILO Archives Geneva; Private collection of Mark Warren)
- (Reference: British National Archives - Perkins Report - folder LAB 18-139)
- (Reference: British National Archive - folder LAB 18-724)
- (Reference: US National Archive SCAP collection - Japan; ILO Archives Geneva; Private collection of Mark Warren)
- (Reference: US National Archive special collections - TWI Foundation; Private collection of Mark Warren)
- (Internal training document of companies like IBM and Kodak; Private collection of Mark Warren
- (Reference: US National Archive special collections; Private collection of Mark Warren)
- Warren, Mark (2012). New Zealand TWI: Appreciation, Operating and Follow Up Programs. US: Lulu. ISBN 9781105722639.
- (Reference: US National Archive special collections for Japan; US Library of Congress for Europe; Private collection of Mark Warren)
- Warren, Mark (2010). The TWI Report - 2nd Edition. US: Lulu. ISBN 9780557279203.
- Official archives of the War Manpower Commission, also see SME site above for Archives downloads