HI Richard,
Is this for inbound or outbound?
First you need historical data!!! (As much as you can find)(callsm, Marketting campaings, demographics etc...)
You need to think about what drives your volumes.
(ie do calls arrive based on set dates, based on marketting activity, specific times of the year ie summer, X-mas etc...)
Then you can start using these historical volumes and compare year on year accurately. Ie if your volumes are based on accounts expiring at the end of the month you can compare month by month. If they are based on weekly events then you need to match the right week of the year with the right week of the year.
Once you get this information lined up you can work out the average volume you have in a specific period. Look at odd years by working out a standard deviation and exclude these. Then apply whatever growth or shrinkage you expect.
This is a very quick explanation for a piece of work that will take a long time.
Its probably better to build your own sheets as they can be built taking your specific requirements into account.
cheers,
Michael
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