Very accessible, historical introduction to the measurement problem. Continues with a thorough and careful examination of Hugh Everett's relative state interpretation of quantum mechanics. Finishes with a description of other "no collapse" theories that have been proposed after Everett. Highly recommended.
Disclosure of Material Connection: Some of the links in the page above are "affiliate links." This means if you click on the link and purchase the item, I will receive an affiliate commission. I am disclosing this in accordance with the Federal Trade Commission's 16 CFR, Part 255: "Guides Concerning the Use of Endorsements and Testimonials in Advertising."