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Educational interventions are often narrowly targeted and temporary, and evaluations often focus on the short-run impacts of the intervention. Insofar as the positive effects of educational interventions fadeout over time, however, such assessments may be misleading. In this paper, we develop a simple statistical framework to empirically assess the persistence of treatment effects in education. To begin, we present a simple model of student learning that incorporates permanent as well as transitory learning gains. Using this model, we demonstrate how the parameter of interest -the persistence of a particular measurable education input -can be recovered via instrumental variables as a particular local average treatment effect. We initially motivate this strategy in the context of teacher quality, but then generalize the model to consider educational interventions more generally. Using administrative data that links students and teachers, we construct measures of teacher effectiveness and then estimate the persistence of these teacher value-added measures on student test scores. We find that teacher-induced gains in math and reading achievement quickly erode. In most cases, our point estimates suggest a one-year persistence of about one-fifth and rule out a one-year persistence rate higher than one-third.

What is known about this topic• Developments in personalisation initially excluded people with learning disabilities.• The organisation InControl has advocated strongly for them and has established best practice in personalisation.• The role of social workers in personalisation is vital to ensure choice, control and protection. What this paper adds• The limits of what is known about personalisation and people with learning disabilities are established.• Key issues, themes, opportunities and critiques in the literature are identified and discussed.• The generic literature about social work and personalisation provides a valuable source of information which can inform current practice with people with learning disabilities. AbstractThere have been rapid developments in personalisation of health and social care in the UK over the past 5 years to develop a more flexible model of provision based upon greater choice and control for service users. This has been important for people with learning disabilities who are often dependent on others such as social workers to support their autonomy and independence. This article discusses a study carried out to explore the impact of personalisation on people with learning disabilities and the role of social workers to support this. A scoping review of the UK literature from 1996 to 2011 was conducted. It was found that there has not been a significant amount of empirical research in this area. Some studies, such as reports by InControl, have suggested that when implemented well, personalisation can have a positive impact on the lives of people with learning disabilities. Other literature highlighted the limitations and critiques of personalisation. Without the right support to manage budgets and autonomy, people with learning disabilities could be left vulnerable. In respect of the social workers, the finding of the review was that there was a lack of guidance on how to implement personalisation and a perceived threat to their traditional practice role, resulting in barriers to implementation. Although the literature emphasises the need for choice, control and autonomy in personalisation, the conclusion of this study is that more research needs to be carried out into how professional roles fit into and can support this process.

This paper constructs a statistical model of learning that suggests a systematic way of measuring the persistence of treatment effects in education. This method is straightforward to implement, allows for comparisons across educational treatments, and can be related to intuitive benchmarks. We demonstrate the methodology using student-teacher linked administrative data for North Carolina to examine the persistence of teacher quality. We find that teacher-induced learning has low persistence, with threequarters or more fading out within one year. Other measures of teacher quality produce similar or lower persistence estimates.