NeoTree research programme overview showing software development cycle linked with research plan and detail of phase 3 methods. NeoTree research programme overview showing software development cycle linked with research plan and detail of phase 3 methods. FGD, focus group discussion; MVP, minimum viable product; SUS, system usability study. Caroline Crehan et al. BMJ Glob Health 2019;4:e000860 © Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.