[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] QA engineers     role of  qualitative user research     versus quantitative user research  2nd  quantitative research     importance of  quantitative user research     versus qualitative user research  2nd  questionnaires  [See user surveys] QuickTime audio format  QuickTime video  Quittner, Josh     bio of      importance of simplicity  2nd  3rd      selecting revenue models