Just a couple of examples from my life - which can be more related to rationality of ISFJ than in general?. I need to know things now (poor intuiton ), If somebody said the beginning of the sentence - I need to know the end too - that is why I have to be pushy if I want to survive. My room can be a mess at times because I need to concentrate on something first- one thing at a time and it takes time usually (poor intuition and applied logic result in the lack of flexibility and missing on chances ). I think it would be interesting to compare tow levels of functioning ( extraverted -behaviour and introverted - thought process).