Hypotheses
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You trust someone when you think you can predict their behavior under challenging conditions.
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According to social expectance theory, you work effectively with your peers when you can predict their behaviors, even if they don't share the same attitudes and values.
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If your team does small-batch-size activities, members are exposed to more learning cycles, increasing their behavior prediction.
Conclusion
Small batch-size activities increase the interactions, increasing their behavior prediction. Once they can foretell how they'll act, they trust each other.