ch is the charter for the project, and Five Criteria, which is the basis for determining whether to consider a PAR, addressing Broad Market Potential, Compatibility, Distinct Identity, Technical Feasibility, and Economic Viability matters. The process further includes a Call for Interest, which is a brief meeting to outline the proposed topic and determine whether there is interest in investigating a possible project, and a Study Group that is a group formed to investigate a project and produce the PAR and Five Criteria. The proposal is submitted to the IEEE 802 EC, and once approved is forwarded to the IEEE-SA Review Committee (RevCom) and the IEEE-SA Standards Board for final approval. On final approval of the proposal a working group or task group is formed to develop the standard specifications. The task group will develop a draft standard, and once completed approves the draft for Letter Ballot within the Working Group. The draft will be refined through several recirculations until all outstanding comments against the draft by Working Group members are resolved based on consensus. The final output of the Letter Ballot process will be forwarded to Sponsor Ballot conducted by a group of individuals affiliated with industry and academia. The draft standard in the Sponsor Ballot may be further revised and refined through several recirculations. The final draft standard is reviewed and approved by the IEEE 802 EC, the New Standards Committee (NesCom), and the IEEE-SA Standards Board, and is published as an IEEE standard. This process is shown graphically in Figure 1-5. An IEEE standard has a validity period of five years from the date of approval by the IEEE-SA Standards Board. Before that validity period expires, the sponsor must initiate the reaffirmation process. This process affirms that the technical content of the standard is still valid and the document is reaffirmed for another five year period. During this five year validity period, amendments (i.e., addition of new features and functionalities) and corr