This book aims to provide the necessary knowledge, skills, and strategies to both educators and parents nurture the growth of thinking skills, more importantly the higher-order thinking skills among their students and their children. Everyone is capable of thinking. For this skills to happen everyone has to be encouraged, taught, and assisted in acquiring the higher-order thinking skills. This book contains three sections: the first, the background, theories, and a review of the techniques one need to know to teach and assess the acquisition of thinking skills and more tools and suggestions. This book has been prepared for prospective and serving teachers in elementary and secondary schools. Besides this, this book may also be used by teacher educators at the teacher education institutions and universities who are involved in the business of preparing teachers and also provide continuous professional development of teachers to teach thinking skills. Parents could benefit from this book in nurturing their children to acquire higher-order thinking skills.