I'm looking for nice overviews on $\phi^{4}$-field theory from the mathematical-physics point of view. To be a little more specific, here are some topics I'd like to read about:

**(1)** What are the motivations, both from the physics and mathematical point of view, to study $\phi^{4}$-theories?

**(2)** What has been (mathematically) accomplished so far? What are the most important open questions nowadays?

**(3)** What are the tools used to (rigorously) study these class of models? Renormalization group, cluster expansions, etc.

My motivation for this question is a rather simple one: I'm teaching myself some field theory but it is really hard to find these discussions on books. In general, books are more interested in solving problems and sometimes I find myself studying some models that I don't know anything about. Also, I'm primarily interested in statistical mechanics, so this helps to narrow the question a bit more. Connections with statistical mechanics and QFT are welcome too, but I don't want a purely QFT reference (I'm sufficiently lost in my own area of interest, after all). Thanks in advance!