The Master Key System was released in 1912, and is one of the first Personal Development courses to be created. The course is more famous now because it is said to be the inspiration behind many of todays top Entrepreneurs and Business Billionaires. Its more recent popularity is possibly due to the fact that it is mentioned as one of the books of inspiration featured in the Secret DVD. The Lessons in the book promote self awareness, visualisation and positive thinking methods, to create a system on how to help you achieve your goals.