It is a great pleasure to present my doctoral thesis in the form of a book entitled Information Efficiency of Indian Stock Markets. 1. Information Efficiency of Indian Stock Markets ? Volume I (Test of Weak Form Efficiency) 2. Information Efficiency and Indian Stock Markets- Vol. II (A Test of Semi Strong Form Efficiency) The book represents the research findings of information efficiency of Indian bourses during various market phases. Volume I of the book discusses in detail the random behavior of stock prices on Indian stock markets and tells the intensity of weak form efficiency. Volume II of the book has shown the impact of various corporate announcements on the movement of stock prices. As the emerging economies give the highest rate of return on the investment in stock market products but the existing non random character of the stock prices may result in irrational movement of the market therefore the investors need to understand the prevailing efficiency in the stock price behavior. The findings will help the reader to understand the efficiency of Indian stock markets in weak form and semi strong form of EMH.