How to Measure Anything - Douglas Hubbard

This book is a treatise against the notion that some important things can’t be measured. Full of information about how to figure what should be measured and then how to measure it. Very thorough and he managed to answer every objection I could come up with throughout.

Deep Work - Cal Newport

Starts with the thesis that a generation of workers have forgotten how to concentrate on mentally challenging tasks. Full of ideas and inspiration for rebuilding your stamina for intense focused thought.