The pace of Charles N'Zogbia was Wigan's principal threat but the visitors' main tactic was to put up resolute defence in a bid to nullify Everton.

BBC: Everton 0-0 Wigan

Its main markets are the United States and Japan, and its principal export is electronics.

ECONOMIST: The Philippines: The good earth | The

At the main office of Fischer Elementary School in the Algiers neighborhood, principal Dahme Bolden is in the middle of a drama that's being replayed all over this city.

NPR: Remaking the New Orleans School System

Dr Perls suggests that the main determinant of both lifespan and age of menopause may be oestrogen, the principal female sex hormone.

ECONOMIST: Ageing

At the time, people were unfamiliar with the concept of a computer password, which required structuring a scene early in the film in which the main character, played by Matthew Broderick, sneaks into his high-school principal's office to check out a piece of paper showing a list of random words.

WSJ: "Disconnect": From Talkies to Texties