Modern day user experience research methods can now answer a wide range of questions. Knowing when to use each method can be understood by mapping them in 3 key dimensions and across typical product development phases.

Some researchers have tested how college students respond to fake dialog boxes in browser popup windows and found that the students are so anxious to get the dialog out of the way, they click right through obvious warning signs.

Designing the User Interface by Ben Shneiderman

A huge amount of worthwhile User Experience Diagrams.