In group decision making, people who hold a minority opinion can change group opinion via social influence.

Yes, in group decision making, individuals who hold a minority opinion can indeed influence and potentially change the overall group opinion. This process is often referred to as minority influence, a form of social influence.

Here are the steps how it happens:

1. Consistency: The minority opinion must remain consistent and unwavering in their viewpoint. This consistency should not be rigid but flexible.

2. Confidence: The minority must express their opinion with confidence and assertiveness, which can make the majority rethink their own views.

3. Defection from the Majority: If one or more members of the majority defect to the minority, then the group may follow suit.

4. The Snowball Effect: Over time, more and more people may start to 'defect' from the majority view to the minority view. As the minority grows, a 'tipping point' is often reached where the minority suddenly becomes the majority.

5. The Process of Change: This process involves both direct and indirect influence. Direct influence happens when people openly agree with the minority's viewpoint. Indirect influence happens when people disagree with the minority's viewpoint but are still influenced by it in some way.

So, through these steps, a minority opinion can change the group opinion via social influence.