Related and recently posted to HN: &quot;Designing for Productive Failure in Mathematical Problem Solving&quot;<p><a href="http:&#x2F;&#x2F;www.manukapur.com&#x2F;wp40&#x2F;wp-content&#x2F;uploads&#x2F;2015&#x2F;05&#x2F;CogSci08_PF_Kapur_etal.pdf" rel="nofollow">http:&#x2F;&#x2F;www.manukapur.com&#x2F;wp40&#x2F;wp-content&#x2F;uploads&#x2F;2015&#x2F;05&#x2F;Cog...</a> (PDF)