Source: https://www.educatorstechnology.com/2016/01/the-four-levels-of-reading-every.html
Mortimer Adler and Charles Van Doren’s 1940 classic How to Read a Book emphasized the four main levels of reading: elementary reading, inspectional reading, analytical reading, and syntopical reading. The book provides everything a learner needs to know and do to progress through and fully function at all levels.
References
Adler, M. J., & Van Doren, C. (1972). How to read a book: The classic guide to intelligent reading. New York, NY: Touchstone.