PICC executes its role as a useful lex mercatoria in the continuously increasing international trade to be adopted as the standard criterion of prevention or dispute resolution. When considering the fact that GISG has not presented results beyond expectation in the past due to hard laws and legal deficiency, PICC, which possesses interpretation and supplementation function, is considered undoubtedly useful particularly in international commercial arbitration. As observed in the previously mentioned analysis on cases accumulated in UNILEX, PICC application and Arbitral tribunal in international contract between parties possess considerably large claim possibility and the number of actual application cases is continuously increasing. The fact that PICC has been composed as maximum common measures of continental and common law systems by traditional comparative legal scholars familiar with international trade can function as the fundamental principle in future global trade activity and can also act as the model law for uniting contract laws of nations. In this aspect, PICC can be evaluated to have considerably achieved enactment purpose of previous intention. However, additional topics that had not been accepted in the revised edition of PICC remain as assignments requiring solution, such as analysis and acceptance problem of comparative law, PR of PICC unfamiliar even to the relative parties of international trade and application in international contract, and absorption problem as model law in various domestic laws.