Over the years I’ve worked with quite a number of companies, in quite a lot of different teams and projects. The older, wiser and more experienced I become, the more surprised I am at many many peoples’ preference for opinion or hearsay over data.
Have you ever spent days (or even weeks) making improvements to something that never gets used? Many people have unwittingly.
Web based businesses have so much data. Often a quick check of how often a page is viewed with Google Analytics can be massively enlightening.