Always look for the simplest solution before you deep into the complicated one. This Occam's Razor principles also known as Law of Parsimony.
We should not make more assumptions than the minimum needed.
For instance, when you find your PC is slow, you do not make a lot of assumptions like your PC might affected by Trojan, OS corrupted, MSN problem and etc. You shud go for the minimum impact assumption- do a quick scan of your PC.
one should not increase, beyond what is necessary, the number of entities required to explain anything