Merrill offers another interesting social model focusing on people's actions rather than their inner feelings. I picked this up for $3.95 at a used book store and didn't realize Merrill wrote it back in the 1980s. While the information isn't too dated, I felt that today's models explain the material better and capture more nuances.
In sum, Merrill advocates that everyone has a personal style based on their assertiveness and emotional focus. People are either assertive or not. And they reserve their emotions (focus on task) or express their feelings (focus on people). He arrives at four types of people that he calls social styles - Drivers, Expressive, Amiable, Analytical. Each style is comfortable with different tasks and ways of communication. But some people are more flexible and comfortable working with other types. Merrill calls this an individual's versatility.
Nothing is new, especially in an age where the DISC is prevalent in work environments. I'm not sure which came first, but it doesn't matter now. I've heard of DISC, and Merrill feels like the newcomer.
The key takeaway is that individuals should add some versatility to their style to work with lots of other people, rather than just those with the same social style. You'll create happier and more productive relationships with more people by adding versatility. Again, nothing groundbreaking and likely why Merrill's model isn't common knowledge, and this book has so few reviews. Altogether not a waste of time but not a book I'd recommend to others.