The graph uses a pair of axes:
- Qualitative to quantitative (The why to the how many)
- Attitudinal to behavioural (What people say to what people do)
On these axes, a load of user research techniques are graphed.
The article also talks about the research techniques best placed to support different phases of product development, and gives an overview of each technique.
When to Use Which User-Experience Research Methods - article by Christian Rohrer on useit.com