SAP authorization concepts in practice: Is there a silver bullet for SAP authorization concepts?

Authorization and license management within the SAP cosmos is a sensitive topic for many companies. While some still doubt the necessity of SAP authorizations - and the associated authorization concepts - others shy away from their implementation due to the high complexity. The fact is: SAP authorization concepts are indispensable for company-wide compliance and IT security. But how do companies obtain a reliable SAP authorization concept without despairing of it?