Total: The sum of all the components must equal the total for all runs.
Units: (optional) All components must use the same units of measurement.
Common units of measure include direct amounts (mass or volume), weight %, % volume by weight, and molecular equivalents.
Name: Provide names for the components to help with later documentation
Change: A factor can be set as Easy or Hard to change.
Easy: indicates this factor will be completely randomized and can potentially change from run to run.
Hard: indicates this factor will be changed as little as possible, restricting the randomization.
Low: The lowest value a component can take (often zero).
High: The highest value a component can take (no larger than the Total)
Edit Constraints button: Click this button to impose additional constraints on component combinations allowed. For more details use the help button on the Edit Constraints dialog.