What made you want to look up negative valence? Please tell us where you read or heard it (including the quote, if possible).
WBS is nothing but Work Breakdown Structure. It is mainly used in Project System (PS) module. Tcode: CJ20N. For any project defined we must have atleast one WBS. Within this WBS we can have networks. Networks are nothing but the series of activities. Material are used to perform the activities.
Research Reports. Purpose: The Physical Mobility Scale (PMS) is used to evaluate the functional ability of aged adults. It has been shown to be reliable and has evidence to support its validity; however, there has been only 1 study performed to date that has addressed its responsiveness.