The authors are senior members of technical staff at Software Engineering Institute (SEI). Paul Clements’ areas of interest include architecture selection, evaluation, representation, and documentation; and software product lines. Paulo Merson draws on 18+ years’ software engineering experience to contribute to SEI’s Software Architecture Technologies (SAT) and Predictable Assembly from Certifiable Components (PACC) initiatives. Felix Bachmann, team lead for architecture-centric product line practices, co-authored the Attribute-Driven Design Method. Len Bass has written two award-winning books on software architecture. He now develops techniques for methodical software architecture design.