Preface to the book by Mr. Rouibah Ahmed, Regional Director Amenhyd SPA, Algeria I present this book written by our colleague Keddar Abdelkader in charge of business within the group Amenhyd SPA where he applied his knowledge to make the field of industrial marketing, the added value seen since some time of his arrival by enriching the debate with ideas on the plans of marketing and relevant remarks in order to improve for a marketing image very high.Customer satisfaction and loyalty are the biggest concerns of companies nowadays because of the fierce competition, the book will clarify the problem by giving tips to ensure a very high rate of customer loyalty. The author has dual expertise as a practitioner and trainer in the field of marketing, MBA graduate marketing of the Ecole Supérieure de Gestion ESG Paris has put a theoretical and practical aspect to make the book a practical guide for readers.