Parliaments have a unique role in ensuring that adopted laws, regardless of who initiated them, are evidence-based and fit-for-purpose. For the executive branch, laws are vital instruments through which they deliver public policy. Governments therefore rely on parliaments to scrutinise and adopt legislation in a timely, well-planned and co-ordinated manner. Parliamentary scrutiny of government lawmaking and its role in ex post evaluation of law implementation helps the legislature hold the executive to account. Evidence-based lawmaking is especially critical to EU integration processes as they involve adoption of many new laws. This paper reviews how laws are planned, initiated, prepared, scrutinised and evaluated by the parliaments of six Western Balkan administrations. The report discusses the concept of lawmaking within a parliamentary system of government. It considers how parliaments and governments co-operate and co-ordinate their legislative activities throughout the lawmaking cycle, providing a comparative analysis of existing rules and procedures as well as lawmaking practices. A set of key findings and policy recommendations are provided to support the Western Balkan administrations to plan and implement future reforms.