When I worked retail during school, my actual job was straightforward: register, stock, closing checklist. The baseline never included analytics of any kind.
But closing every night, I kept noticing we threw away the same bakery items in the same quantities — and one slow week I started logging the waste in a notebook. Ten minutes a night, on my own time, for six weeks. The pattern was unmistakable: we over-ordered two product categories every Tuesday and Wednesday because the standing order didn't account for the weekly rhythm of a nearby office park.
I typed it up as one page and gave it to my store manager, expecting nothing. She adjusted the standing order, waste in those categories dropped visibly within a month, and she started asking me for input on other ordering decisions. It also taught me something I've used ever since: the data you need is often lying on the floor — someone just has to decide it's worth picking up.