The "Grammar Summary", is a core Grammar Reference book, specially designed for adult learners of English who need to check up οn grammatical points. It is suitable for quick reference for adult false-beginners, intermediate and more advanced learners. EFL teachers may also find it useful as a reference book. The book covers all the important areas of English Grammar which are normally taught in adult General/Special Purpose English courses. It is a companion volume to "ENGLISH FOR ELECTRICAL ΕΝGINEERING AND ELECTRONICS STUDIES", Book 1 & 2. However, it can be used as a supplement to any other course book or as a Grammar reference on its own. Besides the material of the book apart from being suitable for use in class is designed for self-study too. The units of the book are not presented in order of difficulty and the material can be used in any order depending of the learner's needs.