Which of the following is not an effective strategy in problem-solving ?

The correct option is Overlooking relevant information.

Explanation:
Problem-solving is a systematic process of identifying a problem, evaluating potential solutions, and implementing the most effective strategy. Effective problem-solving strategies generally involve:

1. Recognizing patterns and relationships: Identifying similarities with past problems helps apply established solutions or concepts.
2. Using logical reasoning: Structured, step-by-step thinking helps analyze causes and consequences accurately.
3. Breaking down complex problems (Decomposition): Dividing a large, intimidating problem into smaller, manageable sub-problems makes it easier to tackle.

On the other hand, overlooking relevant information hinders the problem-solving process. Ignoring critical details or data points leads to incomplete understanding, inaccurate assumptions, and ineffective or incorrect solutions. Therefore, it is not an effective strategy in problem-solving.