The present publication outlines the methodological framework and the practical steps for conducting State Capture Assessment Diagnostics at Sectoral Level, which pioneers a three-dimensional approach, combining mutually-complementary methodologies and their respective instruments for: assessing state capture symptoms and vulnerabilities in the sectors; evaluating the implementation and coverage of anticorruption measures and policies on the level of individual control or regulatory institutions; and risk assessment of corruption-related behaviour in public procurement through original “red flags” indicators, based on the analysis of linked big-data.