Regional specialisation and economic volatility of Czech regions ABSTRACT This thesis deals with the assessment of the impact of regional specialization and regional diversity on economic performance of Czech regions by indicators of economic development: the growth of the average wage, employment growth, rising unemployment, increase in the number of patents and the GDP per person. The second aim is to assess the effect of types of diversity on regional performance. Finally, this thesis aims to assess the impact of diversity on regional resilience by analyzing the development of employment and GDP per person. Key words: Czech regions, diversity of industry, specialization, regional performance, regional resilience, related and unrelated variety, Jacobs' effects, Marshall's effects