The criteria for evaluating the worth of any aid to language learning (whether print or digital, and, in the case of the latter, whether app, program, game, or the software that supports these) must include some assessment of its fitness for purpose. That is to say, does it facilitate learning?
But how do you measure this? Short of testing the item on a representative cross-section of learners, we need a rubric according to which its learning potential might be predicted. And this rubric should, ideally, be informed by our current understandings of how second languages are best learned, understandings which are in turn derived — in part at least — from the findings of researchers of second language acquisition (SLA).
This is easier said than done, of course, as there is (still) little real consensus on how the burgeoning research into SLA should be interpreted. This is partly because of…
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