The content of this book is prepared based on the data collected in the past decade. This book identifies the most prevalent problems that SMEs experience and offers solutions by analyzing their structures and business model on an industrial basis. Particularly managerial problems are appeared as significant obstacles restraining SMEs from continual success and thereby sustainability. The purpose of this book is to shed light on how to overcome these obstacles by taking into account all circumstances affecting existing businesses as well as new ventures especially startups struggling to enter the market.