Dual boot: OS X Mavericks and Mountain Lion?

Hi there,
searching the internet I found a lot of video tutorials and discussions about the proper way to partition your hard drive so you can boot OS X Mavericks from your Mountain Lion system.
However, having installed Mavericks right after its release, I'm trying to install Mountain Lion as a partition on my computer. That's because I need to run some apps which aren't compatible with Mavericks.
As the Mountain Lion installer consistently tells me that it wasn't possible to run the system on my computer I wonder whether there's a way to boot both, Mavericks and Mountain Lion once you have installed Mavericks.
I'm grateful for any advice.
Thanks,
Lukas

If you are trying to run the Mountain Lion installer from Mavericks, it will probably tell you it can't.  I'm currently booted from Mountain Lion and tested the Lion installer and it told me no.
What you can do is make a Mountain Lion USB installer and boot from it.  Now you can select the partition you created and install mountain Lion onto it.  When the installer is finished (it will boot once at least), you'll be in Mountain Lion.  To change back to Mavericks, open system preferences and select startup drive, there you can chose what starts at the next boot.
Instructions for making a Mountain Lion USB are here
http://arstechnica.com/apple/2012/07/how-to-create-a-bootable-backup-mountain-li on-install-disk/

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