The business lesson
Every business already has a weekly rhythm. The question is whether it's a review or a ritual. A ritual repeats the same motions and calls it management. A review asks the same hard questions every week and lets the answers accumulate: what was the outcome, what shipped, what was measured, what's still unmeasured, what did we learn, what needs a decision. Run honestly for a quarter, this loop is the closest thing marketing has to compound interest.
The mechanism is unglamorous. Most of the value is in the unmeasured column: tasks marked done with no proof are where learning goes to die. A review that forces every completed task into a verdict (exceeded, met, partial, missed, or inconclusive) or an honest pending (and refuses to let "done" masquerade as "worked") builds an evidence base that next quarter's plan can actually stand on. The second mechanism is the decision log: write down what you decided and why, and six months later you can tell which instincts were right. Without it, you're re-learning the same lessons at full price.
The review also protects capacity, which is the scarcest resource in most businesses. A good review ends with keep, simplify, skip, or change, and "skip with a reason" is a decision, not a failure. Plans that respect weekly capacity get executed; plans that turn every observation into a task get abandoned by Wednesday.
How Signal & Science enables it
The Marketing Plan page structures the review: "THIS WEEK'S MOVE", "What changed and why", "YOUR PROGRESS SO FAR", "Recorded task results", and "Suggested changes to your plan" (recommendations you act on with "Edit plan with this context", which builds a new draft plan for your approval; never silent changes). Marketing Memory ("What we've learned about your business that shapes each plan.") holds what the system has learned about each client, including from measured results. The TARGETS panel holds the baseline → current → target the review measures against. The weekly digest (Monday 7:00 AM, workspace timezone) starts the loop; the review finishes it.