The distinction worth drawing is between accuracy and appearance, because businesses conflate them and then defer both. Accuracy is urgent: a wrong price, a service you stopped offering, or a phone number that changed produces a bad first interaction with somebody who was ready to buy. Appearance is rarely urgent and gets almost all of the attention, because redesigning feels productive while checking feels like admin.
Run the quarterly check as a specific list rather than a general read through. Prices and packages. Services offered and services withdrawn. Hours including anything seasonal. Contact details. Anything with a date or a year in it. Any claim about how long you have been trading or how many customers you have served. Each of those decays without anybody deciding it should.
Check the links at the same time, both internal and outbound. Pages get renamed, external resources disappear, and a site with broken links reads as neglected regardless of how current the text is. Free tools crawl a small site in seconds, and the internal ones are entirely within your control and therefore the most embarrassing to leave.
Update content that is dated rather than only content that is wrong. A page referencing a year that has passed, or advice about a tool that has changed substantially, is accurate in the narrow sense and signals that nobody has looked at it. Search systems also weigh freshness for some queries, which means a reviewed page can outperform an identical unreviewed one.
Show the review date rather than the publication date where your system allows it. A page written three years ago and checked last month is more useful than the original date suggests, and readers use dates as a proxy for currency. Showing that it was reviewed recently, and actually reviewing it, affects both trust and how the page is treated.
Add rather than rewrite as the default. A page that produces enquiries should be corrected where it is stale and otherwise left alone, because rewriting something that works is the one action in this area with genuine downside. Save the effort for pages producing nothing.
Attach updates to events rather than to the calendar wherever you can. A price change, a new service, a change of hours, or a staff departure should trigger the site edit in the same sitting. That habit removes most of what the quarterly check would otherwise find, and reduces it to a genuine check rather than a backlog.
Then look at what the analytics say about which pages anybody reads, because the answer will redirect the effort. Most sites have a handful of pages doing nearly all the work and a long tail nobody visits. Keeping the first group current matters considerably more than maintaining the second, and pages producing nothing after a year are candidates for removal rather than revision.
Check it on a phone during the quarterly review rather than only on a desktop, since that is where most visitors are and where layout problems introduced by an edit tend to appear. A change that looks correct on a wide screen can push the important content below three scrolls on a narrow one, and nobody notices because nobody checks.
Keep a running note of things to change as you notice them, since the quarterly review is considerably faster when it begins from a list rather than from a fresh read of every page.