The global market is shifting from the industry era to the knowledge era when it is moving towards knowledge and technological innovation, seeking methods to boost competitive advantage. For years, intellectual capital (IC) has been synonymous with intangible assets and knowledge capital. In the last two decades, numerous scholars contributed and analyzed the role and the relevance of the IC to the performance and value creation capabilities of the companies. In this book, I will present different components and definitions of the intellectual capital and the different model of ICÕs measurement