HSI Revenue Management Services - The most results-oriented, highly accountable revenue management team in the business. HSI Creates Intelligent Business Solutions. HSI supports an in-house software development team dedicated to staff productivity and management awareness. Your future planning depends on understanding the particulars of your revenue performance and that means you need a billing partner that both understands them and has the capability to effectively communicate them to you. We believe no one does this better than HSI. And we’re looking for a few good partners.