Two ways. After-call work gets excluded or logged inconsistently, so the number understates how much capacity each contact really consumes. And the moment AHT becomes an agent target it improves while first contact resolution quietly degrades, because the fastest way to end a call is to transfer it or promise a callback. You get a better AHT and more contacts. Averaging across mixed contact types compounds it: a password reset and a billing dispute in the same average describes neither.

It is measured per interval and reported as a period average, which hides the shape of the day. A month at eighty two percent can contain two hours every afternoon at forty percent and the rest at ninety five. The customers who sat in that afternoon queue are the ones who leave, and the average says you hit target. The target itself is usually inherited from a contract nobody has revisited rather than chosen from what the business actually needs.

SLA and service level get used as if they were the same thing. They are not. Service level is what you measured; the SLA is the agreement about which measurement counts. The details that decide whether you pass sit in the window and the exclusions, not in the headline number. Measured monthly, an SLA can be comfortably met by an operation that failed its customers on eleven individual days. Exclusion clauses for outages, volume spikes and force majeure routinely mean the number you report and the experience your customers had are different things. And any penalty attached to a metric agents can influence directly will eventually be met by changing agent behavior rather than by improving service.

Short abandons get counted. Someone who misdials and hangs up after three seconds is not an abandoned customer, but most reports include them, which inflates the figure and buries the trend you actually wanted to see. It also moves when you change your own queue messaging, so a longer greeting raises abandonment without anything about staffing having changed.

The definition is where it fails. A repeat within what window, twenty four hours, seven days, thirty? Same channel or any channel? Most operations measure same-channel repeats within a week, which misses the customer who emailed, gave up, and then called. And FCR taken from agent disposition codes is close to worthless, because you are asking agents to mark their own homework on the metric they are judged by.

High occupancy reads as good on a report and predicts burnout. Held in the high eighties, attrition follows a quarter or two later, and you pay for it in recruitment and ramp cost rather than in the operations report where the cause sits. It is also routinely confused with utilization, which measures against scheduled hours rather than logged-in hours, so two sites reporting the same number can be measuring genuinely different things.

Measured to the minute, it punishes agents for things outside their control. A call that runs past the end of a shift lowers adherence for doing exactly the right thing. Once it is attached to performance reviews, agents optimize for it by wrapping up calls near breaks, which moves the cost into repeat contacts where nobody is looking for it.

There is no standard definition, and that is the whole problem. Whether annual leave is included, whether breaks are in or out, whether training counts, all vary by site and by vendor. It is the most disputed number in outsourcing contracts, because two parties can each report shrinkage honestly and still be thirty percent apart. Comparing shrinkage across vendors without first agreeing the components is arithmetic without meaning.

Response bias. The delighted and the furious answer surveys. The merely served do not. So CSAT samples the two edges of your distribution and gets reported as the middle of it. Surveying immediately after the contact also measures how the agent handled the conversation rather than whether the problem was solved, and those two questions frequently have different answers.

What sits in the numerator varies enormously. Technology, facilities, quality assurance, workforce management, supervision, recruitment and training may each be in or out. A vendor quoting an unusually low cost per contact has generally excluded something you will pay for regardless. Driving the number down by deflecting contacts to self-service only helps if the deflected contacts stay away, and when the self-service does not work they come back harder and longer.

A single blended number hides two unrelated problems. People leaving inside their first ninety days is a recruitment and training failure. People leaving after a year is a management and progression failure. Report them together and whichever is worse conceals the other, so you fix the wrong one. Monthly figures also get annualized by multiplying by twelve, which overstates badly whenever leaving is seasonal, and in this industry it usually is.

Granularity. Measured daily it looks excellent, because overstaffing in the morning and understaffing in the afternoon cancel each other and the errors net out to nearly nothing. Measured at the interval you actually schedule to, the same forecast can be badly wrong. Reporting daily accuracy while scheduling to half hours is how an operation ends up with a healthy forecast report and a failing service level in the same week.