Evaluation of Complex Whole-School Interventions: Methodological and Practical Considerations

Evaluating the impact of complex whole-school interventions (CWSIs) is challenging. However, what evidence there is suggests that school leadership and other elements of whole-school contexts are important for pupils’ attainment (Leithwood et al., 2006), suggesting that interventions aimed at changing these have significant potential to improve pupil outcomes. Furthermore, strong leadership is likely important for the effective implementation of many interventions funded by the EEF since even class-level or targeted programmes are more likely to work best within supportive and effective settings. We therefore welcome the EEF’s commitment to exploring the issues inherent in evaluating CWSIs. Developing design and practice for evaluations of this type of intervention, focusing on the issues of complexity and managing change across a whole school, increases the scope of projects of which the EEF may confidently fund evaluations. In this document, we provide key messages for EEF evaluators on how to get the most out of evaluations of CWSIs, including considerations for both design and implementation. As far as possible, our suggestions aim to be practical steps that evaluators can implement immediately. A number of issues, and points 13 and 14 below in particular, require either further investigation or decisions from the EEF

Placenta-Like Structure of the Aphid Endoparasitic Wasp Aphidius ervi: A Strategy of Optimal Resources Acquisition

Aphidius ervi (Hymenoptera: Braconidae) is an entomophagous parasitoid known to be an effective parasitoid of several aphid species of economic importance. A reduction of its production cost during mass rearing for inundative release is needed to improve its use in biological control of pests. In these contexts, a careful analysis of its entire development phases within its host is needed. This paper shows that this parasitoid has some characteristics in its embryological development rather complex and different from most other reported insects, which can be phylogenetically very close. First, its yolkless egg allows a high fecundity of the female but force them to hatch from the egg shell rapidly to the host hemocoel. An early cellularisation allowing a rapid differentiation of a serosa membrane seems to confirm this hypothesis. The serosa wraps the developing embryo until the first instar larva stage and invades the host tissues by microvilli projections and form a placenta like structure able to divert host resources and allowing nutrition and respiration of embryo. Such interspecific invasion, at the cellular level, recalls mammal's trophoblasts that anchors maternal uterine wall and underlines the high adaptation of A. ervi to develop in the host body

Place-based governance and leadership in decentralised school systems: evidence from England

Relatively few studies have explored the ways in which 'middle tier' institutional arrangements in education, such as school districts and local authorities, are responding to New Public Management reforms characterized by centralization, decentralization, marketization and disintermediation (Lubienski, 2014). This paper analyses these issues, drawing on governance (Tenbensel, 2017) and path dependency theories (Streeck and Thelen, 2005), together with evidence from five locality case studies in England (Greany and Higham, 2018; Greany, 2018). It finds that the process and impact of 'middle tier' disintermediation is uneven and often fraught, with significant implications for place-based coherence, equity and legitimacy. It shows how national hierarchical mechanisms work in concert to require and/or incentivise change across local school systems, most obviously by reducing the remit and capacity of traditional Local Authorities. This process can open up new opportunities for emerging and existing actors to work together through network and community forms of governance to counteract the negative impact of fragmentation, a process that Munby and Fullan (2016) dub 'middle out' change. However, responses and outcomes vary widely across the five localities and productive 'middle out' change is by no means a given, so the article analyses the processes at work and their impact across different contexts. It concludes by assessing implications for research, policy and practice in contemporary education systems

How can the skills of Early Years leaders support other leaders in a primary school setting?

This study investigated the leadership skills Early Years leaders demonstrated through their daily practice of teaching, assessing and teamwork within their setting. It explored how revealing the potential of Early Years leaders could have a positive impact on the leadership practice of other leaders in the same setting to improve pupil outcomes. A qualitative approach using interviews with Early Years leaders in 20 primary settings from the East Midlands and Bedfordshire areas was undertaken by two academics from two different UK based universities. Ethical guidelines ensuring anonymity and trustworthiness were followed. Using verbatim comments, data were analysed in themes against contemporary Early Years literature. Findings showed the skills of Early Years leaders could support pedagogy and practice but some of these skills were not utilized beyond this age phase. Our conclusion suggested that Early Years leaders had a range of leadership skills which were deemed specialist as they were unique to the success of the age phase, but needed to be exposed beyond Early Years for wider success and impact

Host plant range of a fruit fly community (Diptera: Tephritidae): Does fruit composition influence larval performance?

Background: Phytophagous insects differ in their degree of specialisation on host plants, and range from strictly monophagous species that can develop on only one host plant to extremely polyphagous species that can develop on hundreds of plant species in many families. Nutritional compounds in host fruits affect several larval traits that may be related to adult fitness. In this study, we determined the relationship between fruit nutrient composition and the degree of host specialisation of seven of the eight tephritid species present in La Réunion; these species are known to have very different host ranges in natura. In the laboratory, larval survival, larval developmental time, and pupal weight were assessed on 22 fruit species occurring in La Réunion. In addition, data on fruit nutritional composition were obtained from existing databases. Results: For each tephritid, the three larval traits were significantly affected by fruit species and the effects of fruits on larval traits differed among tephritids. As expected, the polyphagous species Bactrocera zonata, Ceratitis catoirii, C. rosa, and C. capitata were able to survive on a larger range of fruits than the oligophagous species Zeugodacus cucurbitae, Dacus demmerezi, and Neoceratitis cyanescens. Pupal weight was positively correlated with larval survival and was negatively correlated with developmental time for polyphagous species. Canonical correspondence analysis of the relationship between fruit nutrient composition and tephritid survival showed that polyphagous species survived better than oligophagous ones in fruits containing higher concentrations of carbohydrate, fibre, and lipid. Conclusion: Nutrient composition of host fruit at least partly explains the suitability of host fruits for larvae. Completed with female preferences experiments these results will increase our understanding of factors affecting tephritid host range. (Résumé d'auteur