This pilot project focused on improving teachers' understanding and use of effective feedback. Participating teachers tried to incorporate feedback into their lessons to help pupils understand their learning goals and become able to develop strategies to reach them. The project employed a cyclical action research design, through which teachers reviewed academic literature on effective feedback before developing ways to apply it in the classroom. The project took place over one school year and involved nine treatment and five comparative schools in the London Borough of Bexley. All pupils in Years 2-6 took part in the study. The pilot evaluation had three aims: (1) to assess the feasibility and promise of an approach to improving feedback which required schools to review, understand and apply research findings, including academic papers; (2) to provide formative recommendations that could be used to improve the approach in the future; and (3) to provide an initial quantitative assessment of the approach's impact on academic attainment that could be used to inform any future trial. Key conclusions from the evaluation are: (1) effective feedback has shown promise in previous studies, but this evaluation demonstrates that improving feedback consistently is challenging; (2) the approach appeared to be most effective when training was communal and when objectives and methods were shared. It was least successful when teachers were unclear about the differences between different types of feedback, and when pupils were unable to set clear success criteria; (3) teachers often struggled to interpret, understand and apply findings from academic research; (4) The study did not seek to assess impact on attainment in a robust way. However, the attainment data which was collected indicated that there may be some evidence of promise for students eligible for free school meals; and (5) one future step may be to try and develop the intervention into a more structured program targeted specifically at low achieving pupils and pupils eligible for free school meals. Greater support, including videos of model lessons could be provided to participating teachers. Two appendices are included.