This document provides guidance for small and medium-sized organizations on developing and implementing an environmental management system (EMS). It explains the benefits of an EMS, such as improved environmental performance, reduced costs and liability, and enhanced public image. The document outlines the key concepts of an effective EMS based on the "plan, do, check, act" model and emphasizes continual improvement. It provides a step-by-step process for building an EMS and details the 17 key elements that comprise the EMS, such as environmental policy, planning, implementation, checking and corrective action, and management review.