Measure the same brand questions period after period and see at a glance which ones are moving.
A brand doesn't live in your logo or in your office. It lives in the heads of your customers, and there's only one way to see it there: ask the same questions regularly and compare the answers. That is brand tracking.
The good news: perceptions move before sales move. A tracker is your early-warning system, long before a trend shows up in the revenue curve.
Up to ten things is plenty; more dilutes the focus:
Measure the same items every period, ideally yearly, and set aside about 5% of your marketing budget for it.
A short survey is enough to start: to newsletter subscribers, to customers after a project, or through an affordable panel. What matters isn't a perfect sample but using the same method at both points in time.
Once a year is the usual rhythm: early enough to feed next year's planning, late enough to reflect the current year.