This document summarizes two models of thinking styles - the Phillips 'Deva' model and the Ned Hermann Group model. The Phillips model categorizes thinking as either 'hard' (objective, tangible) or 'soft' (subjective, intangible). The Ned Hermann Group model describes four thinking styles - type A learns through logic and data, type B through organized consistent approaches, type C through group discussion and personal involvement, and type D through fun spontaneity and variety. The document also provides examples of how companies have used these models to improve team productivity, personal effectiveness, and organizational applications.