- enter the data. all the data
- don't enter data you don't have
- you don't have to do all at once
- a spreadsheet view is available
What
This is probably the most tedious step of all. But if you've made it this far, feel free to take a break and prepare yourself a little something for when you're done.
Entering data is just that: you fill in all the data for your options, according to the form you prepared in the previous step - which can be adjusted if necessary. It is quite common to split this over multiple days if there's a lot to enter, or additional research required.
General advice: try to look at each options on its own first, that is not how much better or worse it is in relation to something else. Un/intentionally skewing the data to favor an outcome can happen to even the most objective sciency person.
When have a larger amount subjective ratings, it can be helpful to reflect on your data once more at the end as well.
How
Fill in the form, scroll down, fill in some more. When all data has been provided, you're done.
Fields with values are colored in for easier differentiation. If you can't provide data for something, you can just leave it blank.