Stability testing

Hi chemists,

Can you share with me good practices in testing the stability of cosmetic products? I want to broaden my knowledge at the theme so any answers are warmly received. I want to understand more about freeze/thaw cycles, because there is a lot of information about it in internet, but the number of cycles is always different, the temperatures are different. Is there any standard for freeze/thaw cycles? 

At the moment I am using the following tests: 
20 minutes at 45oC, then centrifuge it for 5 minutes at 6000 RPM on the day after making it.
2 months at 40oC 

Also what are some tests for water phase products only like shampoos, gels etc.? 

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