This document summarizes revisions made to the Uppsala Internationalization Process Model. The original 1977 model proposed that firms gradually increase their foreign market commitments starting with occasional exporting to nearby countries and psychically close markets, then establishing sales subsidiaries and eventually production facilities. The revised model emphasizes that internationalization occurs through business networks and relationships. Firms learn from partners, build trust over time, and identify new opportunities collaboratively. The revised model better explains rapid internationalization patterns through acquisitions and born global firms. It suggests future research could study when liability of foreignness versus liability of outsidership impact market entry and integrate the network perspective with internalization theory and eclectic paradigm.