Art. 1 CISG
(1) This Convention applies to contracts of sale of goods between parties whose places of business are in different States:
(a) when the States are Contracting States; or
(b) when the rules of private international law lead to the application of the law of a Contracting State.
(2) The fact that the parties have their places of business in different States is to be disregarded whenever this fact does not appear either from the contract or from any dealings between, or from information disclosed by, the parties at any time before or at the conclusion of the contract.
(3) Neither the nationality of the parties nor the civil or commercial character of the parties or of the contract is to be taken into consideration in determining the application of this Convention.
The Secretariat Commentary on Art. 1 of the 1978 New York Draft, predecessor to Art. 1 CISG, gives insight into the drafters' unterstanding on the eve of the 1980 Vienna Diplomatic Conference.
Overview of case law on Art. 1 CISG: UNCITRAL Digest
The UNCITRAL Digest on the CISG can be used as a starting point to discover the relevant case law on this article.