This document outlines the importance of needs analysis in ESP (English for Specific Purposes) course design. It begins with a brief history of needs analysis in language teaching, noting its emergence in the 1970s. It then defines needs analysis and target needs versus learning needs. Several procedures for conducting needs analysis are described, including various data collection devices like questionnaires, interviews, and observations. The purpose of needs analysis in language teaching is to identify students' language needs to design effective courses. For ESP specifically, needs analysis is crucial because courses must teach the English skills students require for their fields. Conducting needs analysis ensures ESP courses are tailored to meet students' particular professional needs.