Can I install Mavericks on a second disk to try it out before committing?

There are some applications I use under Lion that may not be compatible with Mavericks. I can't chance losing work while troubleshooting these possible glitches. I have an empty hard drive on which I would like to install Mavericks form a test drive. Can I do that? It seems like the only option in the Apple store is to upgrade my current system.

That is what I did
I cloned my system disk to an external disk
I then booted from the external and once I was sure of the clone I installed Mavericks
I then did all of my testing of Mavericks from the clone until I was satisfied with it
I then install Mavericks on my system drive
Allan

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