As increasing the pace of productivity growth continues to be a strong challenge in Europe despite the continuous global technology developments, promoting the adoption and usage of digital technology has become more important than ever, particularly among micro, small, and medium enterprises (MSMEs). This guide aims to provide policymakers and practitioners with a comprehensive resource that outlines effective strategies for addressing gaps in com￾plementary capabilities to the digitalization of MSMEs that can help enhance their productivity and resilience. Complementary capabilities are informational, managerial, and behavioral factors condition￾ing successful digital technology adoption. Policymakers need to consider the importance of these capabilities when designing support instruments for firm digitalization. Lack of knowl￾edge and skills, particularly among managers, is a significant barrier to technology adoption.Understanding behavioral factors such as beliefs, organizational culture, and influence of peers and networks, is crucial for policymakers to design effective interventions that address these barriers and promote digitalization.