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Tailoring personality interventions: How timing, context, and strategies influence proximal intervention outcomes
Peter Haehner1, Amanda J Wright1, Till Lubczyk1
1Department of Psychology, University of Zurich.
Journal of Personality and Social Psychology
|March 9, 2026
Summary
Personalized interventions targeting state-level neuroticism, not habit-level, improved momentary affect. Optimizing intervention timing and context, like quiet home environments, enhances adherence and effectiveness for lasting personality change.
Area of Science:
- Psychology
- Behavioral Science
- Digital Health
Background:
- Growing interest in personality interventions for life improvement.
- Existing research shows potential for lasting trait changes.
- Need for clarity on effective strategies, timing, and context.
Purpose of the Study:
- Examine how intervention characteristics predict effectiveness.
- Advance theoretical models of volitional personality change.
- Investigate mechanisms of successful personality change.
Main Methods:
- Intensive longitudinal data from the Changing How I Live Life Study (N=399).
- Smartphone intervention combining experience sampling and mobile sensing.
- Examined effects of strategies, timing, and context on adherence, satisfaction, and affect.
Main Results:
- State-level neuroticism strategies outperformed habit-level strategies for momentary affect.
- Intervention timing and context significantly impacted outcomes.
- Higher adherence observed in quieter environments and at home.
Conclusions:
- Findings inform personality trait change models.
- Provide insights into optimizing personality interventions.
- Highlight the importance of state-level targets and contextual factors.
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