I'm writing a paper with a colleague and we are unsure if the grammar in our title is correct. I'd like to go with this variant.
Multiple Ways to Measuring Alertness
My colleague asks if we should change the title to
Multiple Ways to Measure Alertness
As far as I understand the Gerund, only the first variant is correct. Is that true? ;)
Edit: Based on the comments, would the word "approach" change the grammar in this case?
Multiple Approaches to Measuring Alertness
Multiple Approaches to Measure Alertness