Article 7(2) of the CISG provides the gap filling guidelines for the interpretation of the provisions of the CISG. This provision also defines the boundary of the Convention by stating that questions concerning matters governed by the CISG which are not expressly settled in it are to be settled in conformity with the general principles on which it is based or, in the absence of such principles, in conformity with the law applicable by virtue of the rules of private international law. How to identify those questions concerning matters governed by the CISG which are not expressly settled in it? This paper answers this question where it identifies the boundary of “questions concerning matters governed by the CISG which are not expressly settled in it” by introducing “Five Articles’ Test” as a method for the same.