"意思決定の段階に問題解決の段階を持ち込まないこと。"

Simplified Meaning:

When you have to make a decision, it’s best to keep it separate from solving any problems related to that decision. Imagine you are choosing a college to attend and you're trying to figure out how to pay for it at the same time. If you mix these two tasks, you might get overwhelmed and make a poor choice. First, decide which college is best for you based on important factors like courses, location, and campus life. Once you’ve made your decision, then you can tackle the problem of paying for college with clear focus. By separating these steps, you can think more clearly and make better choices. This approach can help you stay organized and reduce stress.