Just-in-time delivered planning intervention to reduce stress at the workplace among apprentices

INTERVENTION: Participants receive the just‐in‐time delivered planning intervention to reduce stress on their typically indicated most stressful working day (or a randomly chosen working day in case no most stressful day can be identified) during a week. The intervention is delivered 1 hour before apprentices are on their way to work. In case of shift work the intervention is delivered at 6am. The study has an AB/BA crossover design, in which each participant receives the intervention and the control in a randomized order. The randomization sequence will be created using computerized random numbers. There is a period of at least 2 weeks between the intervention and control. Intervention points in time include: 1. Assessment of state of receptivity via SMS text message question (“Are you working today?”) on one of their typically indicated working days, one hour before apprentices are on their way to work (or at 6am). 2. Confirmation of receptivity by a text message reply (“Yes”) from the participant. 3. The digital micro intervention where participants can choose one of two predetermined if‐then plans to reduce stress at the workplace via SMS text messaging and another text message prompt to visualize the chosen plan. Control points in time only include 1 and 2. Follow‐up assessments will be conducted in both intervention and control points in time 11 hours after the assessment of state of receptivity and the random allocation to one of the two intervention conditions. CONDITION: Stress ; Mental and Behavioural Disorders ; Stress, not elsewhere classified PRIMARY OUTCOME: Perceived stress at the workplace, assessed with one item measure 11 hours after the assessment of state of receptivity and the random allocation to one of the two intervention conditions SECONDARY OUTCOME: No secondary outcome measures INCLUSION CRITERIA: 1. Ownership of a mobile phone 2. A perceived stress level at the workplace that is above 3, measured on a Likert scale ranging from 1 (not stressful) to 5 (extremely stressful) 3. Aged 16 or over