Archive for August, 2010

Concurrent-user licensing or not concurrent-user licensing? That is the question!

August 17, 2010

David Shattuck

Last year we deployed a new licensing option for all three of our major software applications. Up until that point, our customers licensed the software on a “per-computer” basis, meaning every computer terminal being used to run the program required its own unique license. As the software industry shifted towards enterprise and network licensing options, we received a steady stream of requests for more flexible “roaming” licenses. Thus, the concurrent-user license was born.

A concurrent-user license allows an organization to install our software on an unlimited number of computers on the same network, giving them the freedom to put these applications into the hands of any/all of their employees without the cost and hassle of managing individual licenses. The only restriction in the concurrent model is the number of people who can access the program simultaneously; when the sixth person attempts to log into a five-user license, they will get a message saying that the server is full.

We still offer the per-computer licenses, but the concurrent-user licenses have been steadily growing in popularity since they were launched.  Consequently, I routinely find myself answering the question “Should I switch to a concurrent-user license?”  My response is always the same:  “It depends.”

The value of a concurrent-user license versus the traditional per-computer license depends heavily on what sort of traffic to the program is anticipated. If you expect infrequent and fairly brief access from many computer terminals, a concurrent-user license would meet your needs for a fraction of what it would cost to license all of those terminals individually. On the other hand, if you have only a few terminals that need near-constant access to the program, it would likely be more cost effective to invest in per-computer licenses. In both scenarios, both licensing options could be applied to grant the required access, but selecting the appropriate license would save a pretty penny.

Please feel free to contact your account representative if you have questions about your specific application or contact me via e-mail at davids@pqsystems.com. We would be happy to discuss different licensing options with you.

Gage R&R study questions answered

August 4, 2010

Matt Savage

We frequently entertain questions about MSA and specifically, gage R&R. Below are two questions we recently received:

Question #1: “What are the requirements for the parts chosen in a study? Do the parts have to have the same specification?”

Answer: The parts selected should be representative of the process variation that is producing them. This implies that selecting 10 consecutive pieces (parts) is not as good as using 10 parts obtained throughout the day or week. Part of what you are trying to do with an R&R study is determine whether your measurement system is capable of distinguishing parts made on the same process to the same specification. In summary, you want to select the parts in a way that represents the minimum sized part, the maximum sized part and those in between. If the selected parts have different specifications, they are different by design, not by random variation.

Question #2: “Results can be calculated in several ways: using study parameters, specifications and others. Which is most acceptable for gage R&R?”

Answer: The industry trend is to use study/process parameters, however, how you calculate the results of a gage R&R study depends on the purpose for doing the study. Before the study begins, you should decide what the primary purpose for conducting the study is. If you are trying to control your process, you need to be able to detect changes in the process. To do this, you should use study parameters or process parameters. If your focus is being able to compare a part to specifications, then you should use the specification method. Using the specification method suggests that you are trying to prove that your measurement system can distinguish between good and bad parts.

If you have any other questions or concerns about MSA or gage R&R, please contact us at support@pqsystems.com or by phone at 800-777-5060 or just post them below.


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