It's best not to change multiple things at once. I understand that there are some advanced "Design of Experiments" concepts that allow you to statistically attribute causes even when you change multiple things at once, but I'm a simple man.
Last night, I went grocery shopping. Then I came home, put away groceries, ate dinner, and helped clean the house in preparation for having some friends over for dinner tonight. I got to bed after midnight and got up before five am. BUT I STILL FOLDED AND PUT AWAY THE DIAPERS BEFORE I WENT TO BED. VICTORY.
What do those two paragraphs have to do with each other? Well, I bought new razor blades last night. For the first time in probably five years, I'm shaving with a new blade. If I started shaving at the sink this morning, too, how would I know which change to blame for any improvements? Also, my wife just put a lot of effort into cleaning the sink and I don't want to mess it up.
Tomorrow, though, I fully intend to shave at the sink. And, for the record, I noticed no real difference in the amount of time it took to shave with the new blade, but the process felt better and I think the shave is closer. VICTORY.
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