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- ...that principle-based hints are better than operative ones; Ringenberg and VanLehn (2006) found that analogous solved examples may be better than conventional30 KB (4,298 words) - 00:11, 16 December 2010
- ...the hypothesis being tested by [[Ringenberg Examples-as-Help| Ringenberg & VanLehn]], that [[Completely justified example | completely justified examples]] su18 KB (2,366 words) - 18:03, 12 May 2008