By contrast nearly all the approaches developed in the last 15 years or so tend to be constitutive theories and interestingly the same is true of some liberal thought. Here theory is not external to the things it is trying to explain and instead may construct how we think about the world or to put it another way our theories define what we see as the external world. thus the very concepts we use to think about the world help to make that world what it is (think about the concepts that matter in your own life such as love happiness wealth status etc)