The posterior border of the ala, shorter than the anterior, also presents two projections separated by a notch, the posterior superior iliac spine and the posterior .PSIS may refer to Posterior superior iliac spine, part of the human hip bone Programme for Strategic and International Security Stu.s PSIS Semarang, .
Stay Informed and Get Involved. Staying informed about your child’s academic performance and behavior at school is key to making sure he she is developing the skills he she will need to be successful in college and careers..There are a number of rules, regulations and guidelines by which prisons are run. These are outlined in Prison Service Instructions PSIs and Prison Service Orders PSOs . From , all Prison Service operating instructions are published as PSIs. They have a fixed expiry date. Prior to .