(in cooperation with BBC UK, Learning English - Learn it Program and Roger Woodham)

I'd like to know the difference between efficient and effective and the way to use them.

 efficient - effective



These two qualitative adjectives are often confused, Kisy. If somebody or something is efficient, then he, she or it works in a well-organised way, without wasting time or energy. Consider the following examples:



    * 'She was efficient in everything she did and was frequently commended for exemplary service to the organisation.'


    * 'He hasn’t made very efficient use of his time in revising for these exams: he has made no notes and his concentration spans appear to last for no longer than ten minutes.'


    * 'This engine is really efficient, it can run for 30 km on only 1 litre of fuel.' 



If something is effective, it works well and produces the results that were intended. Consider the following examples:



    * 'These tablets really are effective. My headache’s much better now.'


    * 'The only effective way to avoid hay fever at this time of the year, if you are a sufferer, is to stay indoors.' 

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