Design Types - Ulrich Response

When reading through Ulrich's writing I was kind of surprised. As he was describing the different ways that designers work, I found out that I use more than one type. In my own design process I combine hierarchical, casual relationships, parallel exploration, and existing artifacts. It makes me wonder if anyone else uses more than one type of exploration in their work, or do they limit themselves to one type? I think they must combine things, as I'm not really sure how one could possible only use one exploration method.