COO's First 100 Days Checklist: 47 Tasks to Complete
A 2024 Heidrick & Struggles study on C-suite transitions found that executive hires who followed a structured onboarding plan were 2.5 times more likely to be rated "highly effective" at the one-year mark than those who improvised their first months. Yet only 29% of new COOs reported having any structured plan for their first 100 days.
The gap is not surprising. Unlike a new VP who inherits a defined function, a new COO inherits the entire operational infrastructure of a company — often without a predecessor to learn from (43% of COO hires are into newly created roles, according to Korn Ferry 2025 data). There is no standard playbook because every company's operations are different.
This checklist solves that problem. It is organized into four phases across 100 days, with 47 specific tasks that apply regardless of industry, company size, or whether you are the first COO or replacing someone. Not every task will be relevant to your situation — but working through this list will ensure you do not miss the critical actions that define a successful transition.
Key Takeaways
- 47 tasks across 4 phases: Orientation (Days 1-14), Assessment (Days 15-45), Action (Days 46-75), and Momentum (Days 76-100)
- The first 14 days should be 90% listening and 10% doing — resist the pressure to demonstrate value through immediate changes
- Your CEO alignment meeting is the single highest-leverage task on this list — get it right in week one
- Track your checklist progress in a simple spreadsheet shared with your CEO — transparency about your onboarding process builds trust
- The checklist is designed to be printed and marked up — cross off tasks, add notes, reorder based on your specific context
Phase 1: Orientation (Days 1-14)
CEO and Board Alignment
- [ ] 1. Hold a 2-hour CEO alignment session covering: mandate, decision rights, success criteria at 90/180/365 days, sacred cows, and communication cadence
- [ ] 2. Document the alignment in writing — send the CEO a one-page email summary and get explicit confirmation
- [ ] 3. Review board materials from the last 4 board meetings to understand strategic context, concerns, and expectations
- [ ] 4. Meet the board chair or lead independent director (even briefly) to understand their expectations for the COO role
Organizational Understanding
- [ ] 5. Get access to all systems — financial reporting, operational dashboards, HRIS, CRM, project management, communication tools
- [ ] 6. Review the org chart and identify every direct report, their tenure, and their recent performance ratings
- [ ] 7. Read the last 12 months of company-wide communications (all-hands notes, internal newsletters, CEO emails) to understand the narrative
- [ ] 8. Review the current strategic plan (or learn that one does not exist — that is a finding)
- [ ] 9. Review the annual budget and YTD performance against plan
Stakeholder Mapping
- [ ] 10. Schedule 1:1s with every C-suite peer (30-45 minutes each)
- [ ] 11. Schedule 1:1s with every direct report (45-60 minutes each)
- [ ] 12. Map the informal power structure — who are the cultural leaders, the institutional memory holders, the unofficial decision-makers?
- [ ] 13. Identify 3-5 skip-level employees to have coffee chats with (front-line perspective is critical)
- [ ] 14. Meet your executive assistant (if you have one) and align on communication preferences, calendar management, and information flow
Phase 2: Assessment (Days 15-45)
The Listening Tour
- [ ] 15. Complete all scheduled 1:1s using consistent questions (see below)
- [ ] 16. Sit in on 3-5 operational meetings without agenda — just observe how decisions are made, who speaks, who defers
- [ ] 17. Visit every physical location (if multi-site) within the first 30 days
- [ ] 18. Shadow a front-line team for half a day — see how the work actually gets done at the ground level
- [ ] 19. Talk to 3-5 key customers (not the happiest ones — the ones who will give honest feedback)
- What is working well that I should protect?
- What is broken that everyone knows about?
- If you had my job, what would you change first?
- Where does work get stuck between teams?
- What would make your job meaningfully better?
Operational Diagnostics
- [ ] 20. Audit the key operational metrics — what is tracked, what is not, and what is tracked but ignored?
- [ ] 21. Map the top 10 operational processes — which are documented? Which run on tribal knowledge?
- [ ] 22. Assess technology landscape — what systems are in use, what are the integration gaps, what is technical debt?
- [ ] 23. Review vendor and contract portfolio — top 20 vendors by spend, contract renewal dates, SLA compliance
- [ ] 24. Assess team capacity — where is the team stretched thin? Where is there surplus? What roles are open?
- [ ] 25. Review the last 5 major operational failures (incidents, missed deadlines, customer escalations) — what caused them?
- [ ] 26. Benchmark your operations — how do your key metrics compare to industry peers?
Financial Assessment
- [ ] 27. Review unit economics — gross margins by product/service line, customer acquisition costs, LTV
- [ ] 28. Identify the top 5 cost drivers and assess which have optimization potential
- [ ] 29. Understand cash flow patterns — when does cash come in, when does it go out, what are the pinch points?
Synthesis
- [ ] 30. Write your State of Operations brief — a 3-5 page document covering strengths, risks, opportunities, and recommended priorities
- [ ] 31. Present the brief to the CEO and align on priorities before sharing more broadly
- [ ] 32. Share an appropriate version with your leadership team — transparency builds trust
Phase 3: Action (Days 46-75)
Quick Wins
- [ ] 33. Identify and execute 3 quick wins — visible, completable in 2-3 weeks, low political risk, tied to real pain points from your listening tour
- [ ] 34. Communicate each quick win to the broader team — not to self-promote, but to demonstrate that listening leads to action
Operating Cadence
- [ ] 35. Establish your weekly operating review — same day, same time, same format, every week
- [ ] 36. Launch 1:1 cadence with every direct report — bi-weekly minimum
- [ ] 37. Set up your monthly business review format with the CEO
- [ ] 38. Create or improve the operational dashboard — the weekly metrics view that the leadership team shares
Team Development
- [ ] 39. Complete your team assessment — for each direct report, document: strengths, development needs, flight risk, and your preliminary view on fit
- [ ] 40. Have a direct conversation with any under-performers — set clear expectations with timelines (do not fire anyone yet unless there is a crisis)
- [ ] 41. Identify your top 2-3 players and invest time in their development — these are the people who will execute your agenda
Process and Systems
- [ ] 42. Launch a process documentation initiative for the top 5 undocumented processes identified in your assessment
- [ ] 43. Make one technology decision — fix one broken tool, implement one missing system, or sunset one tool that is creating more work than value
Phase 4: Momentum (Days 76-100)
Strategic Planning
- [ ] 44. Present your 90-day operating plan to the CEO and leadership team — priorities, metrics, resource needs, timeline
- [ ] 45. Set your first quarterly Rocks (if using EOS) or quarterly OKRs — no more than 3-5 company-level and 3-5 personal
Organizational Development
- [ ] 46. Make any critical personnel decisions you have been developing since Phase 2 — by day 100, the organization should know whether you are keeping the current team or making changes
Self-Assessment
- [ ] 47. Conduct a 100-day self-assessment — what worked, what you would do differently, and what you need from the CEO and organization in the next 100 days. Share this with the CEO as part of your ongoing alignment cadence.
Tracking Your Progress
Use a simple tracking format to stay on course and maintain accountability:
| Task # | Task | Target Date | Status | Notes |
|---|---|---|---|---|
| 1 | CEO alignment session | Day 3 | Complete | Documented in email 1/15 |
| 2 | Written alignment document | Day 5 | Complete | CEO confirmed 1/17 |
| 3 | Board materials review | Day 7 | In progress | Missing Q2 deck |
| ... | ... | ... | ... | ... |
Time Allocation by Phase
How to distribute your hours across the four phases:
| Activity | Phase 1 (Days 1-14) | Phase 2 (Days 15-45) | Phase 3 (Days 46-75) | Phase 4 (Days 76-100) |
|---|---|---|---|---|
| 1:1 meetings and listening | 60% | 40% | 20% | 15% |
| Analysis and synthesis | 15% | 30% | 15% | 10% |
| Execution and decision-making | 5% | 10% | 40% | 45% |
| Operating cadence | 10% | 15% | 20% | 25% |
| Strategic planning | 10% | 5% | 5% | 5% |
Adapting the Checklist by Scenario
If You Are the First COO
Add these tasks:
- Define the COO role boundaries with the CEO in writing (this role has never existed here — expectations will be unclear)
- Build the operational infrastructure from scratch (meeting cadences, reporting, dashboards)
- Prepare the organization for having a new layer of leadership between them and the CEO
If You Are Replacing a COO
Add these tasks:
- Understand why your predecessor left (voluntary, performance, cultural misfit — each implies different risks)
- Meet with your predecessor if possible (even a 30-minute call provides context no one else can give)
- Identify what your predecessor built that works and what needs to change — resist the urge to rebuild everything
If You Were Promoted Internally
Add these tasks:
- Reset relationships with peers who are now direct reports (this is the hardest transition in any internal promotion)
- Establish new boundaries — you cannot be the same colleague you were before
- Prove that you are operating at the new altitude — make visible decisions that demonstrate C-suite thinking
Frequently Asked Questions
Is 100 days too long before making major changes?
No. Research consistently shows that executive hires who take 90-100 days to assess before making structural changes have significantly better outcomes than those who act in the first 30 days. The exception is a clear performance crisis — if the building is on fire, you do not wait 100 days to call the fire department. But most operational issues are chronic, not acute, and benefit from a thorough diagnosis before treatment.
How do I handle pressure from the CEO to show results faster?
Have this conversation in week one: explain your 100-day approach, share this checklist, and align on what "early results" look like. Quick wins in Phase 3 (days 46-75) give the CEO visible evidence of progress. Frame your listening and assessment phases as risk mitigation — the cost of a wrong early decision is much higher than the cost of taking 30 extra days to get it right.
Should I bring my own people into the organization?
Not in the first 100 days, except in cases of clear skill gaps that the existing team cannot fill. Bringing in outside talent too early signals that you do not trust the current team — and it will be interpreted that way regardless of your intentions. Assess the team first, develop where you can, and then make targeted hires based on identified gaps.
What if I discover the company is in worse shape than I expected?
This is common — 62% of new COOs report that the operational reality was worse than what they were told during the interview process, according to a 2025 Egon Zehnder survey. Accelerate your assessment timeline, compress Phase 2 into 20 days instead of 30, and present your findings to the CEO immediately. Do not sugarcoat. The CEO needs to know, and your credibility depends on being the person who tells the truth about operational reality.
How much of this checklist should I share with my team?
Share the framework (your four phases and overall approach) with your entire team. Share the detailed task list with your CEO and perhaps your executive assistant. The team should know that you have a structured plan and that the first 30 days are for listening — this reduces anxiety and sets realistic expectations about when changes will come.