Philip Johnson's legendary and persuasive charm was a prime tool in his arsenal of power.

WSJ: Philip Johnson: Short of Attention Span, Long on Aesthetics

That short-circuited the trade in protocolos, a prime tool in land grabbing.

ECONOMIST: The Brazilian Amazon: How green was my valley | The

Always use Artfact.com as a prime research tool.

FORBES: Magazine Article

Atlantic Basin (Western) plays are little more than a tool to exact top prices in prime Asian markets.

FORBES: Doha's Double Hedge

Prime Minister Lee Hsien Loong has been quick to use the defamation tool himself in the past, having sued a number of international publications.

WSJ: Letters: Challenging Singapore's Defamation Laws

The prime minister said he believed in the power of the internet as a tool in ending the social "digital divide".

BBC: People on internet

But a letter from Mrs May's private secretary to the prime minister's private secretary said the current rules were a "key tool in protecting the public against significant harm".

BBC: Passport control at Heathrow's Terminal 5

The third thing that the Conservative Party and the current prime minister agree on is more controversial: we both believe in user choice as a powerful tool for improving public services.

BBC: NEWS | UK | UK Politics | In full: George Osborne speech