In July 2003, the "Monster Manual" was revised and released again for "D&D" v 3.5. The revision was done by Rich Baker and Skip Williams. The 3.5 revision has a slightly different entry on each monster than 3rd edition. Notably, each monster's attack has been divided into "attack" and "full attack" entries. When asked about the hardest part in revising the book, Rich Baker replied: "The hardest part of the job was probably the sheer volume of the work we needed to do. There are hundreds of monster entries, and each monster has a couple dozen data points to examine and check." Some creatures from the "Psionics Handbook" and the third edition "Manual of the Planes" were added to the revised book. Further revision included the addition of an enhanced version of most monsters as an example of advancement (usually either with a template or with class levels). Many monsters also included instructions on how to use them as player characters.