Abstract

In this research we focus the act of acceptance with amendments of an offer for a contract formation as per the UN Convention on the International Sale of Goods (CIGS). Especially, the study discloses the essence of a significant principle included in this convention, wherefor the answer made envisioned the proposal acceptance through it hold some amendments, which is deemed not as acceptance but as a counter-proposal.  
The survey also mentions the exception of this conventional principle in the case of answer to the proposal having additional or various conditions which do not change substantially the proposal terms. One of the most important questions about this exception presented in the research is to show which of those amendments change the proposal conditions' acceptance. They involve some additional or different provisions about the price, the payment, the quality and the quantity of goods, the place and the time of delivery and so on. The substantial amendments of the proposal represent obstacles for the contract formation.