Simplex Lattice - A simple design to use when all factor ranges are the same. Otherwise, use optimal option.
Simplex Centroid - A simple design to use when all factor ranges are the same. Otherwise, use optimal option.
Screening - This design is useful for screening a large number of ingredients to determine which are the critical few. To keep the number of runs to a minimum, it will only estimate the linear effects.
Optimal - A flexible design choice that accommodates design constraints and model changes
User Defined - Best use may be to create a candidate set that can be read into a d-optimal design selection.
Historical Data - Use this option to create a blank spreadsheet which you can copy and paste pre-existing design information into.
For more complete descriptions of each of these design choices, look in the Help System.