The past month's work on APREA code development has resulted in considerable progress. The input section is complete and debugged. Validation, mass balance, energy balance, and algebra leading to miscellaneous outputs are about 65% complete. A set of computed outputs has tentatively been decided on, and printer output formats have been developed for all of them. A sample printout is presented in the Appendix; Printout has been divided into two sections on each page of 11 x 15-inch printer forms. This type of presentation not only provides a compact, well-organized display on the printout, but also facilitates photocopying onto 8i x 11-inch pages for inclusion in reports. Each half-line of printout is formatted by a Single card image in the program file. This results in a slightly bulkier program, but it provides for great flexibility and convenience when modifying the printout.