The SEI has long advocated software architecture documentation as a software engineering best practice. This type of documentation is not particularly revolutionary or different from standard practices in other engineering disciplines. For example, who would build a skyscraper without having an architect draw up plans first? The specific value of software architecture documentation, however, has never been established empirically. This blog describes a research project we are conducting to measure and understand the value of software architecture documentation on complex software-reliant systems.