It is obvious that the concept of strategy has changed greatly over the past five decades. An understanding of the changes in the way corporates consider strategy may help you craft organizational strategies that would give you a competitive advantage and develop strategies which would relevant and sustainable. tbiConsulting brings this presentation to you with an aim to introduce the various concepts of strategy in the past half century. We address our gratitude to Mr. Robert M. Grant, Author of Contemporary Strategy Analysis, which the content is actually adapted from.