28 paper anthology focused on non-human intelligence, the history of IQ, education, and a heavy emphasis on the CHC factorizations and how this is the dawn of the age of Cattell-Hornquarius.

For a book titled "Handbook of Intelligence" and published in 2015, it is bizarrely antiquated and could have been written in the 1980s - it is totally bereft of the past 6 years of behavioral genetics, from Rietveld et al 2013 to the UK Biobank to the phenome papers to Domingues to the continuity hypothesis work. You would think that these rich and exciting breakthroughs, showing intelligence to have a highly polygenic additive architecture with high intelligence being merely enrichment of common variants and genetic intelligence underlying education / SES / health / lower schizophrenia/bipolar/depression/behavioral-disorder risk (rather than confounding or reverse causation) with 9+ GWAS hits and 80+ upcoming, would be of some interest to the collected authors, but you will not find any of this discussed! You will not find several papers on the topics (nor on any broader behavioral genetics topics), you will not even find so much as a single citation to Rietveld et al 2013, the most important intelligence paper of the past 25 years, likely (I checked; there's one citation to a paper written by Rietveld, but an old and unimportant one). It is like reading a handbook of physics which does not mention the Higgs boson or gravity waves.

You will instead find many dozens of pages devoted to things like eugenics or puzzling papers like "Intelligence as a Conceptual Construct: The Philosophy of Plato and Pascal". This is a huge missed opportunity and I had to raise my eyebrows at the closing comments:

We applaud the work of our colleagues in zoology, evolutionary science, psychology, and education to appreciate the genetic and evolutionary roots of intelligence and to move forward to define intelligence. We are confident that the next 50 years of intelligence research will usher a new age in our understanding, evaluating, and enhancing intellectual development.

Yes, I imagine the next 50 years will indeed be extraordinarily exciting for the field of intelligence; however, I suspect all of that excitement will have very little to do with debates over CHC, the career of Charcot, or how to use IQ tests to diagnose reading disabilities...

Papers I found worth reading were: "Evolution of the Human Brain: From Matter to Mind"; "The Life and Evolution of Early Intelligence Theorists: Darwin, Galton, and Charcot"; "Alfred Binet and the Children of Paris"; "Creativity and Intelligence"; & "Intelligence and Success".