ICIS :: International Commercial Investigation Services We at International Commercial Investigation Services (ICIS) are professional Credit Management Consultants. Operating internationally, we assist our clients to improve their profitability through the We at International Commercial Investigation Services (ICIS) are professional Credit Management Consultants. Operating internationally, we assist our clients to improve their profitability through the successful collection of overdue accounts and bad debts. Furthermore, we do this in such a way without damaging goodwill and normal business relationships. Our experience in this field spans nearly four decades.