If you have no common sense, please ask for help. It is hard to define but everyone knows it when it is demonstrated. In general, common sense is practical knowledge, good judgement and a basic ability to think with reason.
Critical thinking is a step above that with the ability to take in information, be curious, look deeper and be open minded, it's an ability to ask questions and question biases and assumption prior to making a decision.
Here are a few questions you can ask yourself sitting in the meetings (and maybe encourage the Three to ask themselves).
- What would happen if the opposite of my assumption were true?
- Is there a conflict of interest in the person presenting in front of me?
- What could the unintended consequences of this decision be?
- Why do I feel so strongly about this topic?
- Are there other people who we should consult? Would a second opinion be useful in this instance?
- What is the goal of the action? What is the goal of the person presenting?
There are more -
But hey just putting on a common sense hat and ask the question - Does this make sense? Is there something else that makes sense? What are the pros and cons of these actions? Would be a start.