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1.1. Goal setting (behavior)
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Set or agree on a goal defined in terms of the behavior to be achieved
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Goals: select daily goals for number of servings and types of vegetables to consume
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1.6. Discrepancy between current behavior and goal
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Draw attention to discrepancies between current behavior and previously set behavioral goals
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Progress & points; progress: bar graphs showing the discrepancy between goals and recorded consumption
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1.9. Commitment
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Ask the person to affirm or reaffirm statements indicating commitment to change the behavior
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Surprise challenges: users are prompted to select “I’m in!” to affirm their commitment to undertake a surprise challenge
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2.2. Feedback on behavior
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Monitor and provide informative or evaluative feedback on performance of the behavior
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In-app notifications: notifications when users reach 100 % of their daily goal or a 3-day or 7-day vegetable logging streak
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2.3. Self-monitoring of behavior
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Establish a method for the person to monitor and record their behavior
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Select veggies: self-monitoring of vegetable servings and kinds consumed
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4.1. Instruction on how to perform a behavior
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Advise or agree on how to perform the behavior
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Advice & tips: information on how to cook or prepare different vegetable types, and ideas for completing challenges
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5.1. Information about health consequences
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Provide information about health consequences of performing behavior
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Advice & tips: information on health benefits of consuming vegetables
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6.2. Social comparison
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Draw attention to others’ performance to allow comparison with the person’s own performance
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Leaderboard; weekly reports: comparing users’ consumption with others similar to them
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6.3. Information about others’ approval
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Provide information about what other people think about the behavior.
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Weekly reports: great, good, or below average labels corresponding to participant performance
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7.1. Prompts/cues
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Introduce or define environmental or social stimulus to cue behavior
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Push notifications: notifications to prompt self-monitoring of vegetable consumption
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7.2. Reduce prompts/cues
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Withdraw gradually prompts to perform the behavior
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Push notifications: reduction in frequency if user has stopped logging, to reduce likelihood of annoyance
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9.1. Credible source
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Present verbal or visual communication from a credible source in favor of or against behavior
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Goals: indicate the ‘recommended’ daily veg intake from the USDA
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10.4 Social reward
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Arrange verbal/non-verbal reward if and only if effort/progress is made
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In-app notifications: messages to notify the user that a goal or challenge was met
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10.5. Social incentive
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Inform that verbal or non-verbal reward will be delivered if and only if effort/progress is made
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Challenges: challenges with point-based rewards that will be delivered if met
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13.1. Identification of self as role model
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Inform that one’s own behavior may be an example to others
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Push notifications: messages that label users as role models (e.g. You’re setting an impressive example in the Vegethon community.)
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13.2. Framing/reframing
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Suggest adoption of new perspective on a behavior to change cognitions/emotions about it
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Name, tutorial: overall intervention framed as a race to eat as many vegetables as possible (rather than meeting a minimum necessary threshold)
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13.5. Identity associated with changed behavior
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Advise the person to construct a new self-identity
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Push notifications; in-app notifications: messaging to help users begin to identify themselves as vegetable eaters (e.g., calling users ‘Vegethoners’)
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15.1. Verbal persuasion about capability
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Tell the person they can successfully perform the wanted behavior
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Push notifications: positivity even when participants haven’t met goals or interacted with app recently
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