User license purchase strategy
I've read numerous threads on estimating the number of virtual users needed for testing particular systems, but haven't seen info about cost and strategy after we finally pinpoint the specific numbers of VUs that we think would be "ideal" (top number) and "okay, that's acceptable" (middle number) and "oh, well, if that's all we can really afford..." (lowest acceptable number of user licenses)
I hope vendor choice is (mostly) irrelevant in terms of these issues, but just for context we will likely purchase LoadRunner, SilkPerformer, eLoad, or QALoad.
1. Can anyone give me a general sense of the cost differences we should expect to see between a license for say, 50 virtual users, 300 VUs, 500 VUs, and 1000 VUs? At what levels does this typically move from a four-figure purchase to five figures? Does cost rise uniformly, or are jumps at higher numbers of users cheaper than at lower levels?
2. I've seen mentions in other threads of "leasing" users or purchasing licenses in stages -- can anyone provide guidance about overall purchase strategy and tell me which *specific factors* related to our company's current software systems (and systems we expect to test in the future) are key to planning our user license purchase strategy?
Re: User license purchase strategy
If you already have an idea of the Max, Min, and Acceptable numbers of VUs which are of interest, all the rest are questions for your vendor.
Price points are different for each vendor, prices are negotiable, and vendors will talk to you about license purchase plans which meet both your immediate, and long-term needs.