at delegatin

[Mitra584]

Dear to whom may it concern,
Would you please explain it the definition of 'at delegating' in this listening exercise She seems very efficient at delegating http://www.english-test.net/toeic/listening/have_you_filed_all_those_documents_about_the_accident.htmlIs it a noun?and also please explain about the preposition ‘at’ in this sentence.
With the best regard
Mitra
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Peace&Love

[Beeesneees]

at delegating = at distributing the work for other people to do it.
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Cheers m' dears!