(VOVworld)-The External Relations Committees of the National Assemblies of Cambodia, Laos and Vietnam closed its fourth conference on Development Triangle Area in the central province of Nghe An on Friday. Addressing the closing session, Head of the Vietnamese National Assembly External Relations Committee, Tran Van Hang, praised the role played by the three legislative bodies in promoting the triangle development for peace, friendship and development. Delegates agreed on a joint statement on a masterplan to develop the triangle between the three countries by 2020. They pledged to finetune the legal system regarding investment, tax, customs and labor. The next session will open in Cambodia next year.