"Four-hour response" appears on almost every service proposal. It means considerably less than it appears to, and the difference is buried in five specific clauses that most buyers skim.
1. What "response" is defined as
In many agreements, response means a telephone call returned - not an engineer arriving. A four-hour response commitment can be satisfied by someone calling you back at three hours fifty and saying an engineer will attend on Thursday. Look for two separate, separately measured commitments: time to triage, and time on site.
2. Coverage hours versus response clock
A four-hour target inside Monday-to-Friday business hours is not a four-hour target. A failure at 4 p.m. on Friday under 8-to-5 coverage has a response clock that pauses at 5 p.m. and restarts on Monday morning. If your department runs weekends, the coverage window matters more than the response number attached to it.
3. The parts exclusion list
"Parts included" is almost never unqualified. There is a schedule somewhere excluding specific high-value assemblies - X-ray tubes, MRI cold heads, digital detectors, laser assemblies, batteries. These are also, not coincidentally, the components most likely to fail expensively. Find the schedule, read it, and price the excluded items individually so you know your real exposure.
4. What happens when the target is missed
Most contracts state a target and provide no remedy for missing it, which makes the target an aspiration. Ask what the contractual consequence is. A credited month is a modest remedy, but it changes the internal economics for the supplier in a way that a target with no teeth does not.
5. Renewal and escalation mechanics
Check three things: whether renewal is automatic unless you cancel, what the annual price escalation is capped at, and how much notice you must give. Auto-renewal combined with an uncapped escalator is how a reasonable year-one price becomes an unreasonable year-four one with nobody ever making a decision.
What to do with this
You do not need to win every point. You need to know which ones you have conceded. Mark up the draft, ask for the parts exclusion schedule as a separate document, and get the coverage hours written in local time with an explicit statement of when the clock runs.
A supplier who will not put their own published commitments into the contract is telling you what those commitments are worth.
