Jeffrey Zeldman interviews returning guest Sarah Parmenter (.net magazine designer of the year) about designing an app for the homeless; the challenges of multi-device design; teaching HTML and CSS to young people; designing an extremely high-profile multi-platform, multiple magazine newsreader app; the ideal number of employees for a small design studio; Brooklyn vs. Leigh-on-Sea; steeping yourself in platforms you don't use personally; her role as a judge in an upcoming British TV series about design and technology; the increasing complexity of digital design; comping, collaborative, and presentational tools and processes; and more.