The forecast says there’s a 20% chance of rain tomorrow in your city. Does that mean that it will be raining 20% of the time? Or that there’s a 20% chance there will be at least some rain? Or something in between?
And what in the world does this have to with call center metrics?!
The forecast problem illustrates how difficult it can be to work with probability. The most common performance metric used by call centers is the “service level”, which measures how quickly calls are answered. It is defined as a pair of numbers: a percentage value and a time value in seconds. So, for example, an “80/20″ service level means 80% of calls answered in 20 seconds. Like the forecast of rain, this is a probabilistic measurement and can be misleading if not understood properly. Continue reading