Becky,
The core implementation of most WFM tools is identical, so you should expect exact same result for “basic” stuff, e.g. agents vs. call load, utilization, ASA, etc.. There are differences, however, in the statistical modeling and in assumptions made about human behavior when calculating, for example, abandonment rate, retry rate, and so forth. If these are important to you, you’d want to understand how the tool of choice calculates them.
Try EasyErlang (www.DiagnosticStrategies.com/EasyErlang.htm) which is free, and calculates most of the required parameters over a very large range of loads
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