Sir Michael said any deployment of ground troops would probably be only for a short period, with very clearly defined objectives.

BBC: UK troops set for Afghan role

This is a fundamental issue about setting clearly defined goals and objectives, appropriate utilization of resources, effective measurements, and communicating updates and milestones.

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Lord Moynihan, winner of an Olympic silver medal for rowing in 1980, urged organisers to "focus on a few, well-targeted and clearly-defined sports legacy objectives".

BBC: Olympics debate