Welcome to Services Ordering Solutions: Avoiding MAS Confusion! Through our experiences as former DOD contracting officers, and with our constant interaction with ordering agencies, we have developed knowledge and experiences using GSA Multiple Award Schedules (MAS) for Professional Services. This site was developed so that we can share lessons learned with our customer agencies. We are always looking for ideas to develop new content. If you would like to see something that is not on this site currently, please send us an email with your request. Again, Welcome!