The normal revision process for the HPD Open Standard is annual.  Suggestions for improvement are welcome at any time, from anyone.  HPDC members are asked to provide their input early in the process, through an open call for suggestions, typically in the June-August timeframe.  Normally the docket for new features is closed in September, to ensure that the HPDC Board, Technical Committee and Staff have the time necessary for development, due diligence and approval.  

In the event that an issue is found that needs more immediate improvement in order to ensure the effective functioning of the Standard, the Standard revision process allows for the issuance of errata and addenda, in the interim period between revisions.