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<span>The use of Web 2.0 communication practices in assessment may offer a new approach to assessment 'as' learning, a goal for assessment that is more highly valued than assessment 'of' and even 'for' learning in the literature. This paper describes a case study of a wiki-writing assignment that aimed to achieve this goal. The stakes were high, in that the assignment was worth 100% of the mark and the assignment was set for a group of tertiary teachers who were enrolled in a unit of study about student assessment as part of a Graduate Certificate in Tertiary Education. This paper analyses how the wiki-writing assignment shaped assessment 'as' learning in four ways, through: finding a language for talking about assessment; collaboration (interaction); dialogue (expression); and inquiry learning (cognition).</span>

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Many schools and school systems have been deliberately working towards full implementation of Assessment for Learning for more than a decade, yet success has been elusive. Using a leader%s implementation of Assessment for Learning in one school as an illustration, this article examines eight positional leaders’ experiences as they implemented both the ‘spirit and the letter’ of Assessment for Learning at all levels. This longitudinal qualitative research study draws on the experiences of leaders from Alberta, British Columbia, Germany, Georgia, Hawai'i, Manitoba, New Zealand and Ontario. The authors identify five findings that show how positional leaders use Assessment for Learning as the focus for system‐wide change, as well as the change process itself.