Sorry about the confusion, Anabel, we can see how that sentence could feel all tangled up! This is taking into account that different ingredients have different weights. So half of your starter is four ounces, one scant cup of all-purpose flour is also four ounces, and half a cup of water is also four ounces. This is because water weighs quite a bit more than flour. So four ounces of water is a lesser volume, four ounces of flour is a greater volume, and four ounces of starter (which is a mixture of flour and water) is somewhere in between. Hope that's helpful! Kat@KAF

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