Microsoft mandated its Security Development Lifecycle (SDL) in summer 2004. Despite massive changes in how technology is used and how software is created, it still provides the foundation for the software security programs at many of the worlds largest and most influential software organizations. Despite all we know about creating secure code, many organizations still struggle with making secure development work in practice. The three most significant changes to the development process over the last decade and half can be summarized as follows: diversity of languages, speed, and supply chain.”]
Source: https://www.csoonline.com/article/3440120/lessons-learned-through-15-years-of-sdl-at-work.html