This publication provides practical guidance on how to conduct a safety culture self-assessment. The focus is on using such assessments as a learning opportunity for organizational growth and development rather than as a fault-finding or 'find and fix' exercise. The approach involves considerable engagement with all levels of the organization. Methods applied include document reviews, questionnaires, interviews, observations and focus groups. Besides the complexity and subtleties of safety culture it also describes how to avoid common pitfalls in analysing results. The information presented in this publication will be of interest to individuals engaged in assessing and improving safety culture.