This book examines the relationship between family influence and financial performance and non-economic goals in small and medium family-owned enterprises (SME) in Portugal. Research on the performance of family-owned firms is growing but results are mixed, especially for non-listed companies. This book examines smaller family-owned firms that operate in a small, open economy, characterised by a context of relatively weak capital markets and predominantly bank-based financing. Delving into the impact of key variables such as the power dimension, experience and culture on performance establishes, the book goes on to analyse the determinants of performance in such family-owned SMEs. Given the importance of family firms to open economies, this book would be a valuable read to scholars aiming to understand the reasons behind their success, managers seeking out strategic and operational guidance and to regulators and policymakers at the regional and national levels.