The legacy of Chavism remains a challenge for the future of the region and a threat to American security.

CENTERFORSECURITYPOLICY: Chavez��s Deeds: He Was A Threat to America and His Own People

The legacy of confidence means it is the challenge of politicians and civic leaders to foster that spirit so it doesn't disappear along with the fleeting summer sun.

CNN: London 2012 legacy: Trust the British to get it right

Suren Thiru, UK economics director at the BCC, said the challenge facing the UK was to develop a "long term economic legacy" post-2012.

BBC: Olympics and Jubilee 'boost international opinion of UK'

For the implementation, the IT department and the Compaq team faced another challenge: implementing the system in phases over the course of 12 months without disrupting the service of the legacy systems.

CNN: Lockheed finally finds e-mail success