Selma made an error while creating a chart to describe the technological design process for a new vacuum. which best describes how selma can correct the error in her chart?

It would be helpful if you can provide the chart or any additional information about the what Selma made. Anyhow, as I've searched on the internet, the answer is - Switch the stages "Evaluate the solution" and "Design a solution."

Protons have a positive charge and, collectively, give an element its atomic number.