Scheduled Reopening. Unless otherwise agreed upon by the parties, negotiations shall be reopening for the following school year at the request of the Association not sooner than April 1 of each year (unless otherwise mutually agreed) to consider: benefits and three (3) unspecified issues to be determined by the Association and three (3) unspecified issues to be determined by the School Board and other reopeners as defined by agreement including the items for PPC discussion in the Addendum to this contract.