What a summary leaves out

A summary is a compression of a source, and compression always makes choices. The choice becomes important when someone in the source disagrees.

The Purdue OWL guide to quoting, paraphrasing, and summarizing distinguishes three jobs. A quotation keeps the source’s words with attribution. A paraphrase restates a passage in new wording with attribution. A summary condenses the main ideas into a shorter overview, also with attribution. Purdue advises reading the full text first so the main points and supporting points can be identified. That is writing guidance, not evidence that AI summaries usually erase dissent.

Here is an explicitly fictional source passage:

“The town council approved a Saturday market in the station square. Supporters said the market would give local growers a regular place to sell produce and would bring more visitors to nearby shops. Councillor Mira Sen voted against the plan. She supported the market itself, but objected to the proposed closing time of 8 p.m. She said the council had not published a noise plan for residents living above the square. The motion passed 6 to 2, with the closing time unchanged.”

A short summary that says, “The council approved a Saturday market to support local growers and nearby shops,” preserves the decision and the supporters’ reasons. It loses Sen’s specific objection, her support for the market in principle, and the missing noise plan.

A dissent-preserving summary could say, “The council approved a Saturday market for local growers and nearby shops, while Councillor Mira Sen supported the market but opposed its 8 p.m. closing time because no noise plan had been published for residents above the square. The motion passed 6 to 2 without changing that time.”

The second version is longer because the dissent changes the shape of the decision. It tells the reader that the disagreement was about implementation, not the market’s existence, and it preserves the unresolved condition. I would not require every summary to include every minority view. My editorial test is narrower: if an objection changes what a reader would reasonably think the decision means, the summary should either include it or signal that the overview is selective.

Before accepting a summary, compare it with the source and ask three questions. What decision survived? What reasons survived? Did an objection alter the scope, condition, or uncertainty of that decision? A summary can be short without being neutral in effect. The missing sentence may be the one that tells you what the agreement did not settle.