JMIR MENTAL HEALTH Robinson et al Tutorial Methodological Challenges in Web-Based Trials: Update and Insights From the Relatives Education and Coping Toolkit Trial Heather Robinson1, BSc, PhD; Duncan Appelbe2, PhD; Susanna Dodd2, BSc, MSc, PhD; Susan Flowers1, BA; Sonia Johnson3, BA, MBChB, MSc, MRCPsych; Steven H Jones1, BSc, MSc, PhD; Céu Mateus4, MSc, PhD; Barbara Mezes1, BA, MSc, PhD; Elizabeth Murray5, FRCGP, PhD; Naomi Rainford2, MSc; Anna Rosala-Hallas2, BSc, MSc; Andrew Walker1, BA, MA; Paula Williamson2, BSc, PhD; Fiona Lobban1, PhD, ClinPsyD, BA 1Division of Health Research, Spectrum Centre for Mental Health Research, Lancaster University, Lancaster, United Kingdom 2Department of Biostatistics, Clinical Trials Research Centre, University of Liverpool, Liverpool, United Kingdom 3Division of Psychiatry, University College London, London, United Kingdom 4Division of Health Research, Lancaster University, Lancaster, United Kingdom 5Research Department of Primary Care and Population Health, University College London, London, United Kingdom Corresponding Author: Steven H Jones, BSc, MSc, PhD Division of Health Research Spectrum Centre for Mental Health Research Lancaster University Bailrigg, Lancaster LA1 4YW Lancaster, United Kingdom Phone: 44 (0)1524 593 Email:
[email protected] Abstract There has been a growth in the number of web-based trials of web-based interventions, adding to an increasing evidence base for their feasibility and effectiveness. However, there are challenges associated with such trials, which researchers