Mushon discusses open source design and how to make collaboration on design easier. Some key challenges are that designers don't commonly use open source like developers do and that inconsistent design fragments the message. Mushon proposes putting all master files online, exploring versioning tools for design, using code when possible, conducting research to define an extensible design language, documenting the language, sharing resources through blogs, and recognizing that both leadership and openness are needed for open source to work for design. The goal is to make collaborative design easier through establishing common processes and standards.