The SRTC, according to its mission to promote the statistical knowledge of society, in addition to conducting research projects and writing books, has chosen the translation and publication of authoritative foreign sources as a policy and a suitable way to be updated on the world knowledge. The translation of the present book is one of the measures that have been included in the agenda of the SRTC to implement this policy, and it is hoped that it will be useful for researchers and students in the field of statistics and related fields. Survey-based research has evolved dramatically over the past two decades. This book, entitled "Survey Methodology", describes the basic principles of survey design, which have been discovered in methodological research in recent years, and provides guidelines for successful decision-making in the design and implementation of high-quality surveys, as well as key considerations in design and implementation of a sample survey, is included, and shows the place of science in the surveying, in a concise and understandable manner, thematically. The present book has been translated by Dr. Mohammad Salehi and Mohammad Amin Jamalzadeh and edited by Ms. Giti Mokhtari Amir Majdi and Dr. Hamidreza Navabpour.