London Knowledge Lab, Institute of Education, UK, m.mavrikis@ioe.ac.uk, http://link.lkl.ac.uk/isee;London Knowledge Lab, Birkbeck College, UK, sergut@dcs.bbk.ac.uk, http://link.lkl.ac.uk/isee;The Open University, UK, p.mulholland@open.ac.uk, http://link.lkl.ac.uk/isee