The plan and the debrief are the same tool used twice. One opens the quarter; one closes it. Without the debrief, every quarter is an isolated 90-day cycle that produces no learning — you plan, you execute, you stop, you plan again from scratch. With the debrief, each cycle teaches the next one. By the fourth quarter you are planning meaningfully better than you were in the first, because four debriefs have fed the planning practice.
This post is about the pair: the 90-Day Goal Planner at the start, the 90-Day Debrief at the end. Same cadence, opposite ends. Together they produce the quarterly rhythm that turns a year into four learning cycles rather than twelve months of undifferentiated work.
The opening · the 90-Day Goal Planner
The 90-Day Goal Planner is sixteen pages, completed in two to three hours at the start of each quarter. It produces:
- Three objectives drawn from the Annual Blueprint's four domain outcomes
- Three to five key results per objective, each numerical, achievable but stretching
- A weekly check-in schedule for the thirteen weeks
- Twelve weekly pages for tracking progress against the objectives
- The first quarter's narrative — a one-page statement of what success looks like for this specific quarter
Used as written, the Planner produces a quarter with clear direction, measurable progress points, and explicit weekly touchpoints. The framework is OKR-derived (see setting 90-day goals) and adapts the corporate methodology to one person.
The closing · the 90-Day Debrief
The 90-Day Debrief is the document that closes the quarter and feeds the next one. Eight sections, two to four hours in one sitting, written in long form rather than checklist form:
- What were the objectives, and which hit / missed?
- What unexpectedly worked?
- What unexpectedly didn't?
- What habits formed, and which broke?
- What's changed in the broader context since I set these objectives?
- What did I learn that I want to remember in five years?
- What am I leaving behind from this quarter?
- What is the central question of the next quarter?
The output is a document of 8-15 pages of handwriting. Filed alongside previous quarterly debriefs. By the end of year two, the stack of eight debriefs is one of the most valuable personal documents you own.
Why the pair works · the learning loop
Each individual quarter, in isolation, is just a 90-day cycle. Plan, execute, stop. The pair turns this into a learning loop: plan, execute, debrief, plan, execute, debrief, plan, execute, debrief. The debrief feeds the next plan, which produces a better quarter, which produces a better debrief, which feeds an even better plan.
Three specific mechanisms that produce the compound effect:
- Pattern recognition. By the fourth debrief, you can read all four in sequence and see patterns invisible from inside any single quarter. The Q1 objective that "unexpectedly worked" became a Q2 explicit objective. The Q3 habit that "broke" turns out to break every Q3 because of a seasonal factor. These patterns are only visible across the stack.
- Calibration of ambition. The first quarter's objectives are typically either too easy (you hit everything) or too hard (you hit nothing). By the third quarter, you've calibrated — objectives are stretching enough to be challenging and grounded enough to be achievable. This is the Google "0.7" calibration applied at the individual level.
- The central question carries forward. Each debrief ends with the central question of the next quarter. This is the thematic spine that connects the quarters into a coherent year. Without it, the four quarters are isolated; with it, they form a narrative.
The Plan and the Debrief — the same tool, twice
The 90-Day Goal Planner (£3.99) and 90-Day Debrief (£3.99) are designed as a paired artefact. Inside the Groundwork OS, the two are explicitly linked — the Debrief inherits this quarter's objectives automatically, and the next quarter's Planner inherits the Debrief's central question and learnings. The learning loop runs in the system, not in your memory. Together: £8 in print. £19.99 for the OS. £54.99 for the complete bundle with every format.
See the Groundwork OS →The dates that matter
The traditional calendar quarters work fine. Plan in early January for Q1, debrief in late March. Plan in early April for Q2, debrief in late June. And so on. The slight psychological lift of the cultural Q1/Q2/Q3/Q4 framing is genuine.
But the cadence works on any 90-day cycle. You can start in mid-February and end in mid-May. The framework is what matters, not the start date. If you're reading this in the middle of a quarter, start the cycle now — don't wait until January.
The one date that does matter: schedule the next debrief immediately when you complete a plan. The 90-day debrief date goes into your calendar as soon as you finish writing the 90-day plan. Otherwise, three months from now, when the quarter is closing and you're tired, the debrief gets skipped. With the date pre-committed, you have made the appointment with yourself in advance, and you keep it.
The honest next step
If you're at the start of a quarter, the 90-Day Goal Planner (£3.99) is the entry point. If you're at the end of one, the 90-Day Debrief (£3.99) is the entry point. The pair at under £8 is one of the highest-leverage combinations in the Groundwork ecosystem.
The complete Groundwork bundle at £54.99 includes both alongside the rest of the 28-tool ecosystem. The Groundwork OS at £19.99 runs the pair as a connected loop where each quarter's Debrief feeds the next quarter's Plan automatically.
The plan opens the quarter. The debrief closes it. The pair is what turns a year into four learning cycles.