Many educators know of Bloom's taxonomy of educational objectives in the cognitive domain. Some, especially PE teachers know of the taxonomy for the psychomotor domain. Few know of the affective domain, yet it is perhaps the most important and least understood.
This is the domain addressing attitude and values and how to assess them. YES, you can assess (though perhaps you shouldn't grade) attitude and values.
This is actually a reference work, not a book to read through unless you're doing research. It's quite detailed and technical reading at times.