'Transactional Analysis, or TA, is a theory of how humans interact with each other – its main application being to help understand human behaviour and communication: each interaction between people being called a “transaction”. It was developed by Canadian psychiatrist Eric Berne and has been a tool in the trainer and coach toolbox for many years in helping us under'

http://trainer-tools.com/2015/04/25/transactional-analysis-for-trainers-part-one-understanding-ego-states/