David Crocker's Verification Blog

When RTCA released DO-178C – the long-awaited update to the DO-178B standard for airborne software – they added a number of supplements to cover specific software development techniques. One of those techniques is object-oriented software development, covered by supplement DO-332. This supplement mentions the Liskov Substitution principle (hereafter abbreviated LSP) in FAQ #14 “Why is the Liskov Substitution Principle (LSP) important?” and gives more detail in FAQ #15 and #16. So, what is the LSP, and how can we make sure that a software design adheres to it? Read more…