The award-winning paper was published in 2015 in the journal Applied Linguistics:
Alderson, J. C., Brunfaut, T., & Harding, L. (2015). Towards a theory of diagnosis in second and foreign language assessment: Insights from professional practice across diverse fields. Applied Linguistics, 36(2), 236-260.
The study reported in this article investigated how diagnosis is theorized and carried out across a diverse range of professions with a view to finding commonalities that can be applied to the context of second and foreign language assessment. On the basis of interviews with professionals from fields such as car mechanics, IT systems support, medicine, psychology and education, a set of principles was drawn up to help inform a comprehensive theory of diagnostic assessment in a second or foreign language.
The award committee commented that the article was ground-breaking and promises to shape future research and practice in diagnostic language assessment. The article is freely available here: https://academic.oup.com/applij/article/36/2/236/170015/Towards-a-Theory-of-Diagnosis-in-Second-and
Read the ILTA official announcement.