Is there an index that monitors companies' nonfinancial performance?

I would think you need to compare performance among a set of peers. Obviously, if looking to compare various dimensions of working capital management, you would want to look within an industry specific set of peers. Same goes for measuring customer service. If, however, you want to compare business processes, such as planning, accouting, financial reporting, billing or approving invoices for payment, maybe you would want to look at relative cost, staff productiviy, and cycle speed.The way to do this is to map your processes to a common "business process framework" that allows different organizations to compare apples and apples. Then again, you could "softer" measures that may be indicators of organizational success, such as rankings for "best company to work for in XYZ city."