Arthur Whimbey on Intelligence as a skill
Arthur Whimbey's definition of intelligence:
“Intelligence in an attentional/processing skill used in analyzing and mentally reconstructing relations. The distinguishing feature of this skill is breaking down complex relations (or problems) into small steps that can be dealt with fully. The major components of the skill are extensive search and careful apprehension of all details relevant to the relation; thorough utilization of all available information including prior knowledge; accurate comparisons; and sequential, step-by-step analysis and construction.” - Arthur Whimbey, Intelligence can be Taught (New York, NY: E.P. Dutton & Co, 1975), 120.
Whimbey saw intelligence as a generalized skill.
Book Review: Stuart Ritchie's Intelligence: All that matters

Stuart Ritchie, Intelligence: All That Matters. (Hodder & Stoughton, Kindle Edition 2016).
As an educator and leader, I try to stay up to date on research into personality and human potential. But sometimes I cannot keep up with recent findings. Stuart Ritchie's new book helped fill the gaps.
Dr. Ritchie is a post-doc researcher at the University of Edinburgh where he is researching the development/decline of intelligence across the life span.