Generally, the CISG governs contracts for the sale of goods between businesses located in separate signatory countries. Our Chicago business attorneys handle a range of business contracts, from contract review and development, to negotiation and enforcement.This handbook guides attorneys through the process of creating, formatting, and modifying contracts. Experienced Chicago Contract Attorneys Helping Illinois business owners craft comprehensive business deals. We'll help you craft the best vendor contract agreement for your specific needs, and help you manage that relationship as long as you need it. Section II introduces the current technology of smart contracts and how it can be used for international sales agreements. Plus, explore the insight and resources available in the Chicago REALTOR® Magazine digital issues. All changes made to a contract within a transaction can be tracked and timestamped. Procurement Services. We are the contracting authority for the procurement of goods and services for the City of Chicago.