DO-178C, also known as Software Considerations in Airborne Systems and Equipment Certification, is a standard for certifying software in airborne systems. The standard provides guidelines for developing software that meets the safety requirements of aircraft systems. A key component of DO-178C certification is the Stages of Involvement (SOI) audit, which ensures that software development is conducted in compliance with the DO-178C standard. In this blog, we will discuss the DO-178C standard and the SOI audit process in detail.