How regulations are implemented and enforced, and how compliance is ensured and promoted, are critical determinants of whether a regulatory system is working as intended. Inspections are one of the most important ways to enforce regulations and to ensure regulatory compliance. Based on the 2014 OECD Best Practice Principles for Regulatory Enforcement and Inspection, this Toolkit offers government officials, regulators, stakeholders and experts a simple tool for assessing the inspection and enforcement system in a given jurisdiction, institution or structure. Its checklist of 12 criteria can be used to identify strengths and weaknesses, gauge actual performance, and pinpoint areas for improvement.