| Discussion Paper circulated for comments by scientific community | 2024 |
| Lead Authors and Review Editor established | 2024 |
| Chapter author teams assembled | Jan - Feb 2025 |
| Zero Order Drafts (ZODs) due | 7 April 2025 |
| First meeting of SSC with Lead Authors in York, UK | 16-17 April 2025 |
| Lead Authors refine ZODs based on discussions from York meeting & upload to Google Drive folder | 18 April - 7 May 2025 |
| Author teams develop First Order Drafts (FODs) | May - July 2025 |
| Preliminary First Order Drafts (FODs) due | 31 July 2025 |
| SSC review of FODs | 1-22 August 2025 |
| Authors finalise FODs and format for external review | 25 August - 12 September 2025 |
| External review of FODs | mid September - mid October 2025 |
| Author meetings, including Review Editor involvement, to address comments on FODs | November - December 2025 |
| Second Order Drafts (SODs) due | 31 January 2026 |
| SSC review of SODs and revisions by Authors | February - March 2026 |
| Assessment team meeting to finalize report and draft Executive Summary messages | w/o 23 March 2026 |
| External review of SODs | late April 2026 |
| Draft Executive Summary | June 2026 |
| All cited papers accepted for publication | 1 June 2026 |
| Final draft of core assessment completed | 30 June 2026 |
| Panel Review Meeting for Executive Summary, Geneva, Switzerland | 20-24 July 2026 |
| Executive Summary completed and submitted to the WMO Ozone Secretariat | September 2026 |
| 2026 Ozone Assessment submitted to the WMO Ozone Secretariat | 31 December 2026 |