The timetable on a station platform is one of the most closely read promises there is. It does not say the train will leave as soon as possible. It says 07:12. That is exactly why everyone gets slightly irritated when the board suddenly shows 07:19, and also why we can plan our mornings around it.
An SLA in customer service works the same way. SLA stands for service level agreement, an agreement about the level of service customers can count on. It can cover how quickly a call or email should be answered, how quickly a case should be resolved and when customer service is open. In other words, an SLA swaps "we will get back to you as soon as we can" for a time that can be kept and followed up.
Why does customer service need an SLA?
Because "quickly" means different things to different people. A customer who emails on a Friday afternoon may expect a reply the same day. The team assumes the email will be answered in turn, which in practice means Monday morning. Nobody has done anything wrong. Nobody had agreed on anything either.
An SLA makes expectations clear in both directions. The customer knows what applies, and the team knows what to prioritise when the queue gets crowded. It also makes customer service measurable in a way you can actually discuss. How quickly do we really answer, and do we deliver what we promised? Without a target the question is impossible to answer, and with one it suddenly becomes rather concrete.
What happens when the SLA only exists on paper?
Plenty of teams have an SLA. Fewer know on an ordinary Tuesday whether they are keeping it. The agreement says 80 per cent of calls should be answered within 20 seconds, but nobody can see the queue in real time, and the result only turns up in the monthly report. By then it is too late to do anything about the Monday morning that went off the rails.
The consequences tend to arrive in a certain order:
- Customers stop trusting the promise: An SLA that is often broken soon becomes a number nobody takes seriously.
- Staffing turns into guesswork: Without data on when queues grow, you cannot plan for the peaks.
- Urgent cases drown: When everything is handled in turn, the important waits as long as the simple.
- The agreement can cost money: Some agreements with business customers include compensation or penalties if the service level is not met.
As it happens, something can be done about this, and it starts with working out what an SLA should contain.
What does an SLA in customer service contain?
An SLA in customer service usually contains targets for response time, resolution time and availability, sometimes supplemented by quality targets. The targets are often set per channel and per priority, since a call and an email are not expected to be answered equally fast. These are the most common parts:
- Response time: How quickly a customer should get a first reply. For phone it is often measured in seconds, for chat in minutes and for email in hours.
- Service level: The share of contacts answered within the response time, for example 80/20, meaning 80 per cent within 20 seconds.
- Resolution time: How long a case may take before it is resolved, often different for different types of case.
- Availability: When customer service is open and what happens to contacts outside opening hours.
- Exceptions and escalation: What counts as urgent and who takes over when a target cannot be met.
SLA and service level are often mixed up. The SLA is the agreement, while service level is a metric that is often part of it.
How do you set an SLA you can actually keep?
Start with reality rather than ambition. Look at how quickly you answer today, when queues build and which cases take longest, then set targets that are a little better than now but not unreasonable. An SLA that is kept every week does more for trust than an impressive target broken every other day.
- Start from customer expectations: Ask what customers actually need, not just what is convenient internally.
- Split by channel and priority: A call about an outage should not wait as long as a question about an invoice.
- Decide how you measure: Count from when the contact arrives, and be clear about what counts as an answer.
- Review and adjust: Go through the results regularly and change the targets when the business changes.
We have covered which metrics are worth tracking alongside the SLA in how to measure customer service the right way.
How to keep your SLA with Lynes
An SLA is kept in the moment, not in the monthly report. So most of it comes down to seeing the situation while there is still time to act:
- Analytics: Track response time, service level, queue lengths and answered calls in real time. You can set thresholds for answer groups, get a notification as soon as something deviates and schedule reports to the people who need them.
- Wallboard: Show service level, queue times and waiting calls on a screen in the room, so the whole team sees the same picture and can pitch in before the queue grows.
- Callback: Let customers skip the queue and be called back when it is their turn. During a peak, that can be the difference between a customer who waits and one who hangs up.
A Monday morning with Lynes might look like this. The threshold for the support group raises an alert when service level drops, two colleagues jump into the answer group and customers in the queue are offered a callback. By about ten o'clock the promise is back on the right side.
Frequently asked questions about SLA in customer service
What does SLA stand for?
SLA stands for service level agreement. In customer service it is an agreement about the service customers can expect, such as how quickly calls and emails should be answered, how quickly cases should be resolved and when customer service is open. An SLA can apply to customers or work as an internal target for the team.
What is the difference between an SLA and service level?
An SLA is the agreement itself, the promise about what service customers will get. Service level is a metric for the share of contacts answered within a set time, and it is often one of the targets in an SLA. You could say that service level shows whether you are keeping what the SLA promises.
What does 80/20 mean in customer service?
80/20 means that 80 per cent of calls should be answered within 20 seconds. It is a common service level target for phone, but it is not a rule that suits everyone. A team handling simple questions may aim higher, while technical support may need different targets. What matters is that the target reflects what customers expect.
What happens if an SLA is breached?
That depends on the agreement. An internal SLA usually leads to a review and adjustments to staffing or ways of working. Agreements with business customers may include compensation or penalties when the service level is not met. Either way, the best protection is spotting deviations as they happen, so there is time to act before the promise is broken.
TL;DR
The timetable works because it says 07:12 rather than "soon". An SLA in customer service does the same for your replies: it puts a time on the promise, so customers know what to expect and the team knows what to prioritise. Set targets you can keep, split them by channel and priority, and follow the situation in real time rather than after the fact.
If you want to see how it works in practice, it is all on the page about the Lynes contact center. We cannot promise the trains will run on time, but we can help with your SLA.
