Founding, the pivot, the first big customer, the funding, today. Five to eight entries — a company history with twenty entries is an archive, not a story.
Do not include an entry only because it was hard. Include it because it changed what happened next.
What shipped, what is shipping, what is planned. Mark the boundary between done and promised clearly, and date the promises loosely.
A roadmap read as a commitment is how a timeline becomes a complaint. Say “planned” on the sheet.
Phases with owners and dates, so everybody looking at the wall knows what week the project is in.
Show dependencies as an order, not as arrows crossing the page. If the arrows cross, it is a diagram, not a timeline.
The history of the internet, of a treaty, of a disease. The classic educational timeline, and the one people share most.
Cite the dates. A shared timeline that gets a date wrong travels further than the correction.