Which aspect of a problem-and-solution essay refers to the process putting solution into effect?

The aspect of a problem-and-solution essay that refers to the process of putting a solution into effect is called the implementation.

Here's why:

* Solution is the proposed answer to the problem.

* Implementation is the action taken to put the solution into practice. It describes the steps, strategies, and resources needed to make the solution a reality.

For example:

Problem: The local park is littered with trash.

Solution: Install more trash cans and encourage volunteers to pick up litter regularly.

Implementation:

* Step 1: Purchase and install 10 new trash cans in strategic locations.

* Step 2: Partner with a local community group to organize weekly volunteer clean-up days.

* Step 3: Promote the volunteer program through flyers and social media.

The implementation section is crucial because it shows the reader that you've considered the practical aspects of your solution and how it can be successfully applied.