The Training Course on " an Introduction to Error Sources in Surveys and Methods for Their Control and Reduction " was held by Dr. Lida Kalhori, Faculty Member of the Statistical Research and Training Centre, in that Centre from 28 to 29 July 2019 for 8 hours. In this Training Course, issues such as introducing non-sampling errors and their types, methods for calculating measurement error and its creation sources, an introduction to non-response error and the ways to deal with the error were presented and described.