This note is an explanation of QSSP-II (Queueing System Simulation Program). We have reported QSSP-II in No.133 of Technical Note of PHRI (mar. 1972). Various kinds of improvements and revisions, carried out on this proto-type during the last 15 months, are summarized and exaplained in this note. Major points of improvements are as follows:
ⅰ) Load module program is improved.
ⅱ) Structure of programs are revised.
ⅲ) Output formats are improved.
ⅳ) Several types of priorities among the different queueing system are newly added. Check mechanism is extended and error messages become more comprehensive.