Answer:
Avoiding stating preferences and opinions at the outset.
Step-by-step explanation:
Groupthink is a common phenomena that takes place when people have to collaborate and make decisions. Groupthink happens when decisions are not made based on the merits of an opinion, but instead by an urge to conform or to avoid disagreement. This happens because groups sometimes value cooperation and harmony more than the decision itself. A way in which we can reduce or avoid this is by not stating personal preferences and opinions a at the outset. This will reduce the chances of people feeling compelled to conform.