Index[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] validity [See invariants] variables operational variables domain definitions of 2nd identifying 2nd state variables [See state variables] vehicle components matching to use cases Mega Motors example (QFD overview) 2nd 3rd 4th |