I just started to look into doing starters again after a long break and something I noticed is the online calculators now have steps. I ignored this and refreshed my memory on the 100g of DME per 1 litre formula and then starting using my stir plate. But after reading some more I think I missed something basic that I never knew. Is there a point where you are supposed to do multiple steps for a starter? For example, I just did a 2.5 L starter with a single pack of yeast. Now I'm wondering if maybe I was supposed to first do 1 litre then step it up twice to 2.5. Is there any guideline on this?