Powers of 10: Time Scales in User Experience

From 0.1 seconds to 10 years or more, user interface design has many different timeframes, and each has its own particular usability issues.

Nielsen, Jakob. Alertbox (2009). Articles>Usability>User Experience>User Interface

Discount Usability: 20 Years

Simple user testing with 5 participants, paper prototyping, and heuristic evaluation offer a cheap, fast, and early focus on usability, as well as many rounds of iterative design.

Nielsen, Jakob. Alertbox (2009). Articles>Usability>Testing>Methods

Agile User Experience Projects 

Agile projects aren't yet fully user-driven, but new research shows that developers are actually more bullish on key user experience issues than UX people themselves.

Nielsen, Jakob. Alertbox (2009). Articles>Project Management>User Experience>Agile