This white paper discusses the modernization of SAS applications on mainframe systems, addressing the challenges and strategies organizations face in this process. It outlines the historical context of the SAS language and mainframe computers, emphasizing their significance in enterprise operations. The document presents various modernization strategies, including rewriting SAS applications in other programming languages and replatforming them to distributed systems or cloud environments. It highlights the risks and costs associated with these traditional approaches, such as disruption and potential performance issues. The paper introduces Altair SLC™, a new alternative that allows organizations to modernize their SAS applications with minimal changes to existing infrastructure. It also emphasizes the importance of considering factors like licensing, regulatory compliance, and performance when choosing a modernization path. The document serves as a guide for organizations evaluating their options for maintaining and modernizing their SAS applications while leveraging existing investments.