Zara is facing several challenges for continued international growth, including political factors such as the Catalan independence movement, social factors like the rise of online retail in the UK, economic factors like the Eurozone debt crisis and technical factors like advancements in computerization technology. Additionally, Zara's market entry method, similar to the stage model of internationalization, is no longer efficient for entering new markets away from Spain. The company also faces strong competition in the fashion sector, particularly in the UK, which makes it challenging to expand its business into new regions.