 The main purpose of "training" is to develop and retain skills, knowledge, understanding and abilities, and most training is occurs in conditions which facilitate learning.These conditions usually involve an environment which is free of avoidable discomfort, surprises, and other distractions, allowing focused concentration on understanding and mastering the components and combinations of skills.This is generally effective when performance will be under similar circumstances, but when transferred to stressful operational conditions, reliable performance is not guaranteed.