As with a faulty assembly line, when defects go unspotted until the end of the process it is usually too late to fix them.

ECONOMIST: Education

The bottom line is FHA uses a faulty econometric model that vastly underestimates defaults to forecast losses.

FORBES: Meet The New Subprime: It Will Cost Us Billions

Frustrated with the faulty answering machine in his new Compaq Presario, Dale Johnson clicked into an on-line bulletin board last July.

FORBES: Lawsuit.com

On 15 February 2004, a faulty 16-tonne wagon broke free and sped down Shap Summit killing four men working on the West Coast Main Line.

BBC: Tebay rail deaths anniversary: Ceremony held at memorial

That extra attention to detail has already begun at the Ferrari factory as the team's engineers solved the problem with Alonso's faulty drag reduction system (DRS) -- an overtaking aid which increases the car's straight-line speed by flipping open the top flap of the rear wing -- the day after the Bahrain Grand Prix.

CNN: Ferrari boss: 'We have to be perfect'