Stephen Downes Theory

I am having trouble finding a theory. I have looked through his blogs and have not found any choices to look at. I think I am going about it the wrong way. I am typing theories into the search for Stephen Downes and it comes back with weird info. I need some help. Either, how to find a good theory to research or just give ma a web link to read. Why I am having so much problems with it I don’ t know. Please help.