In case you missed it, Understanding Insider Movements (William Carey 2015) was released a few months ago. For better or worse, now the term “IM” is guaranteed to stick around for a while.
Ayman Ibrahim posted a review of UIM at The Gospel Coalition blog and I responded to him in the comments. I really hope we can move beyond the political nature of the IM discussion and at least not describe it as a monolithic entity as I felt the review did (plus the review described an extreme end of the spectrum which I also felt was inaccurate and unfair). My comment ended being a bit of a book review itself. In any case, I hope not to be drawn into a fruitless blog debate about the merits of IM. :–)
UIM is an important and impressive book. By my count, about 75% of it was previously published. But the sheer volume of the book (64 articles + appendix) is a testimony to the fact that evangelical missiology has made some positive steps forward in the last couple decades. You don’t have agree with everything in UIM (I don’t) to benefit from it. But you can read more of my thoughts here.