I am making available an MA assignment I wrote a while ago about the design of assessment tasks for children. In it, I examine how tasks which effectively assess the language ability of children can be designed. It was written while I was working at Cambridge English as a Subject Officer for the YLE tests and I refer to the research the tests underwent as part of the 2007 review of the YLE tests.
NB The two internal documents from Cambridge English are not publicly accessible (Guidelines for Oral Examiner Training and Coordination and Instructions to Oral Examiners) Also note that the latest YLE information is available online: http://www.cambridgeenglish.org/exams/young-learners-english/
I hope you enjoy reading my MA assignment.