Finally in the fourth box the cause is unknown, but the solution is simple. What could be a situation for this one? Hmm You know that a macro can be a suitable solution for automating an Excel worksheet. However, you are not aware of how to create a macro. Here, the solution is simple, but the cause is unknown. Similarly, if you are unwell, you may not know the reason what would you do?

In the earlier example, you would consult with an expert who knows how to create macros. And in the second example, you would consult with a doctor. Hence, in these type of scenarios, you would seek an expert. Now that you are thoroughly aware of the causal use grade. It is time to go through an exercise.