Index[A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Z] feature cards 2nd feature-driven development features AND/OR thinking about continual improvement and 2nd 3rd documenting metrics for non-feature work and planning development of simplicity and reliability and time spent developing vision and feedback from users 2nd in continual refinement iterative development and retrospectives and flexibility flywheel metaphor fun functionality freezes |