An innovative method for teachers to formatively assess writing online

Assessment is an integral component of effective teaching and a teacher’s professional judgement influences all routine aspects of their work. In the last 20 years, there has been considerable work internationally to support teachers in using assessment to improve student learning. However, there is a pressing issue that impedes teacher professional judgement being exploited to its full potential. The issue relates to teacher assessments in the context of extended performances such as essays and arises from the complexity of obtaining reliable or consistent teacher assessments of students’ work. Literature published in the United States, England and Australia details evidence of low reliability and bias in teacher assessments. As a result, despite policymakers’ willingness to consider making greater use of teachers’ judgements in summative assessment, and thus provide for greater parity of esteem between teachers’ assessment and standardised testing, few gains have been made. While low reliability of scoring is a pressing issue in contexts where the data are used for summative purposes, it also an issue for formative assessment. Inaccurate assessment necessarily impedes the effectiveness of any follow-up activity, and hence the effectiveness of formative assessment. In this session, Dr Sandy Heldsinger and Dr Stephen Humphry will share their research of writing assessment and explain how their research has led to the development of an innovative assessment process that provides the advantages of rubrics, comparative judgements and automated marking with few of the disadvantages

Ptychography

Ptychography is a computational imaging technique. A detector records an extensive data set consisting of many inference patterns obtained as an object is displaced to various positions relative to an illumination field. A computer algorithm of some type is then used to invert these data into an image. It has three key advantages: it does not depend upon a good-quality lens, or indeed on using any lens at all; it can obtain the image wave in phase as well as in intensity; and it can self-calibrate in the sense that errors that arise in the experimental set up can be accounted for and their effects removed. Its transfer function is in theory perfect, with resolution being wavelength limited. Although the main concepts of ptychography were developed many years ago, it has only recently (over the last 10 years) become widely adopted. This chapter surveys visible light, x-ray, electron, and EUV ptychography as applied to microscopic imaging. It describes the principal experimental arrangements used at these various wavelengths. It reviews the most common inversion algorithms that are nowadays employed, giving examples of meta code to implement these. It describes, for those new to the field, how to avoid the most common pitfalls in obtaining good quality reconstructions. It also discusses more advanced techniques such as modal decomposition and strategies to cope with three-dimensional () multiple scattering