Decide whether to assign at the individual, team, or department level. Individual assignment increases sample size but risks contamination and scheduling conflicts. Team-level assignment preserves shared rhythms and reduces spillover, but reduces statistical power. Match the unit to collaboration realities, tooling, and leadership sponsorship so measured effects reflect actual working conditions rather than laboratory convenience.
Use randomization to balance known and unknown confounders, but never at the expense of dignity. Offer opt-ins, transparent purposes, and clear stop conditions. Avoid penalizing non-participants. If randomization is impossible, use staggered rollouts or matched controls. Ethical practices increase participation quality, reduce bias from hidden resistance, and ultimately yield results stakeholders believe instead of politely ignore.
Break habits spread informally, which is good culturally but risky analytically. Mitigate spillover by assigning intact teams, communicating boundaries gently, and keeping documentation available to all after the study. Track cross-team collaboration and shared calendars to quantify bleed-through. If contamination occurs, model it explicitly, or reframe the analysis as policy adoption rather than a strict experiment.
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