Foreign investment plays a key role in economic development. Indeed, it is this type ofinvestment that provides the necessary economic factors, namely investment and technicalknowledge, for economic growth. Advent of new means of global communication and advancesmade in a wide range of science fields has led to enormous and more complicated internationaltransactions. The resulting disputes and complication are obviously beyond the scope of localcourts which deal with local lawsuits. In fact, many international commercial disputes referred tolocal courts led to lengthy and expensive court hearings and has caused a number of problems forthe parties involved. Furthermore, international arbitration was established and was laterimproved to an extent that in most international business contracts, both parties agree that shouldany dispute arise in connection with their contract, they will resolve it through internationalcommercial arbitration. Therefore, determining the law governing international commercialarbitration is of paramount importance. This paper aims to analyze various theories ondetermining the law that governs arbitral vote.