Migrate the Brussels office (140 workstations, 3 floor switches, 1 core router) from the legacy 100 Mbps network to the new 1 Gbps infrastructure during a single weekend maintenance window (1–2 February 2026). Success criteria: zero unplanned downtime on Monday morning, all devices connected to the new VLAN, and VPN connectivity confirmed for 12 remote-first staff.
Migration completed by Sunday 18:00, 6 hours ahead of the deadline. 137 of 140 workstations connected successfully on Monday morning. Three devices (2nd floor, meeting rooms B and C) required manual VLAN reassignment — resolved by 09:45. VPN connectivity confirmed for all remote staff by 10:00. Measured throughput averaged 940 Mbps (target: 900+).
What went well
What could improve
| Action | Owner | Deadline | Status |
|---|---|---|---|
| Update asset management system to classify meeting room devices as network endpoints | MC | 14/02/2026 | In progress |
| Send maintenance communications 48 hours before start, not same-day | TL | Standing | Done |
| Add pre-migration inventory checklist step to the network migration SOP | SV | 21/02/2026 | In progress |
Review action item completion at the 21 February operations stand-up. The asset management update (MC) will be verified by cross-referencing the CMDB export against the physical device audit for the Antwerp office migration scheduled for
Structure how your team debriefs projects and events. This template captures what was planned, what actually happened, why the gap exists, and what to change next time — so lessons feed future projects instead of fading from memory.
Try now in EliumAn after action review is a structured debrief conducted after a project, event, or milestone to capture what was planned, what actually happened, and why the two diverged. It produces documented lessons and specific action items that feed back into future work.
Originating in military operations and adopted across project management, the after action review sits between the immediate post-incident report and the broader retrospective. It is narrower than a full retrospective — focused on a specific deliverable or phase — but more structured than an informal debrief. The output is a concise document any team member can reference before starting similar work.
Without documented reviews, teams repeat the same mistakes. Lessons stay with whoever was in the room, invisible to the next team facing the same challenge.
This after action review template is for teams responsible for project delivery and operational quality:
The template has two parts: structured metadata fields and narrative sections.
Metadata fields set the context:
Narrative sections walk through the after action review:
Capture faster. After the review session, feed Elium’s AI the meeting notes or discussion transcript. It generates a structured first draft — objectives, outcomes, analysis, and action items — that the facilitator reviews and refines instead of writing from scratch.
Retrieve smarter. Before starting a similar project, ask Elium’s AI: “What lessons did we learn from the Brussels office migration?” The AI returns specific findings and action items from your previous after action review — not a generic project management guide.
An after action review is only valuable when the next team can find it. A debrief saved in a local folder helps one team once. A structured review published in Elium helps every team that faces a similar challenge — because AI-powered search surfaces lessons from a natural question, not a file name.
Bouygues — 53,500 employees across construction, telecoms, and media in 80 countries — centralised operational knowledge in Elium to solve exactly this problem. Project lessons were siloed in local drives and email. By structuring knowledge in Elium, they gave distributed teams a single source of truth — reducing repeated mistakes and making cross-site learning practical.
Related reading: Read more on our blog
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