Methodology
From scale development to a 20,057-participant RCT
The ethyx survey logic is grounded in a four-study doctoral programme. See the Coppin (2018) thesis reference for the APA citation and abstract. Each study increased sample size and design rigour. Use the pages below for transparent, linkable summaries suitable for methods sections, government briefings, and due-diligence questionnaires. Harvard-style web references and the working source index live in the research dossier.
- Study In=1,247 · Cross-sectional validation — unemployed AustraliansThe first empirical test of the adapted stage-of-change measure in an Australian employment-services sample. Established that distinct stages of genuine commitment to jobseeking exist and relate to subsequent employment outcomes.
- Study IIn=332 · Follow-on investigation (PhD programme)Second empirical investigation in the doctoral series, extending psychometric and substantive questions from Study I with a focused sample before scaling to larger cohorts.
- Study IIIn=2,459 · Scaled field investigation (PhD programme)Third study in the thesis sequence, increasing statistical power and external validity ahead of the definitive randomised trial.
- Study IVn=20,057 · Four-year randomised controlled trialA large-scale RCT demonstrating that stage-matched interventions outperformed treatment-as-usual across demographic and jobseeker classifications — the evidentiary anchor for policy-relevant claims.