Error can vary more widely than just 5-10%. For example, the same careful measuring to within 5-10% at 1-cup will result in ~40% error at 1/4 cup. And also, pe

Error can vary more widely than just 5-10%. For example, the same careful measuring to within 5-10% at 1-cup will result in ~40% error at 1/4 cup. And also, people vary in their cooking ability, especially around reaching out to new recipes. It can be hard to get recipes to turn out right, and sometimes it's hard to tell what went wrong.