by LSI Dylan Wiliam Center | Apr 4, 2019 | Evaluation, Formative Assessment, Teaching
Article originally published in District Administration By Shawna De La Rosa Testing impacts learners and schools in the U.S. differently than it impacts those in many other nations In most of the developed world, high-stakes tests make or break a student’s...
by LSI Dylan Wiliam Center | May 11, 2018 | Formative Assessment, Teaching
All those who produce tests claim that their tests are valid and reliable. Unfortunately, such claims are meaningless, because tests cannot be valid, and they cannot be reliable. A failure to understand why such claims are incorrect means that the substantial power of...
by LSI Dylan Wiliam Center | Jul 30, 2015 | Teaching
By Dylan Wiliam The Panorama program “Can I sack teacher?”(broadcast on BBC on July 5, 2010) made a big play out of the fact that only a handful of teachers have been struck off for incompetence. Doctors and lawyers are generally struck off for negligence, not lack of...
by LSI Dylan Wiliam Center | Mar 18, 2015 | Teaching
By Dylan Wiliam In a 1984 paper, Benjamin Bloom reckoned that one-on-one tutorial instruction had an impact of two standard deviations on student achievement, but this claim is meaningless unless the sensitivity to instruction of the measure of achievement is...
