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One school of thought which is widely accepted by many language teachers is that the development of our conceptual understanding and cognitive skills is a main objective of all education. Such conceptual understanding is arrived at not through ‘blind learning’, but through a process of discovery which leads to genuine understanding (Lewis 1986: 165). The things we learn for ourselves are absorbed more effectively than things we are taught.
The practical implications of this view are quite clear: instead of explicitly teaching the present perfect tense, for instance, we will expose students to examples of it and then allow them, under our guidance, to work out for themselves how it is used. Instead of telling students which words collocate with crime, we can get them to look at a computer concordance of the word and discover the collocations on their own. Instead of telling them about spoken grammar we can get them to look at transcripts and come to their own conclusions about how it differs from written grammar. What we are doing, effectively, is to provoke ‘noticing for the learner’.
(HARMER, Jeremy. The practice of English language teaching.
4th ed. Longman, 2007. pp. 72-73. Adaptado)