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</o:shapelayout></xml><![endif]--> <meta name="application-name" content="gfidisc.scisys.co.uk "> </head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dear Peter and colleagues,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Personally I would vote for option 4 (presuming this includes option 3).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Stuart<o:p></o:p></span></p><p class=MsoNormal style='line-height:12.0pt'><span style='font-size:11.0pt;color:#7A2B2E'>__________________________________________________________________<o:p></o:p></span></p><p class=MsoNormal style='line-height:12.0pt'><b><span style='font-size:11.0pt;color:#7A2B2E'><br></span></b><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#7A2B2E'>Stuart Fowell</span></b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#7A2B2E'><o:p></o:p></span></p><p class=MsoNormal style='line-height:12.0pt'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#7A2B2E'>On-Board Software Architectures<o:p></o:p></span></p><p class=MsoNormal style='line-height:12.0pt'><span lang=FR style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#7A2B2E'>Space Division<o:p></o:p></span></p><p class=MsoNormal style='line-height:12.0pt'><b><span lang=FR style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#C72E2D'>SCISYS UK Limited<o:p></o:p></span></b></p><p class=MsoNormal style='line-height:10.0pt'><span lang=FR style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#343434'>T: +44 (0)117 916 5138<br>M: +44 (0)7715 750255<br>F: +44 (0)117 916 5299<o:p></o:p></span></p><p class=MsoNormal style='line-height:10.0pt'><span lang=FR style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#343434'>E: stuart.fowell@scisys.co.uk<br>http://www.scisys.co.uk<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> cesg-all-bounces@mailman.ccsds.org [mailto:cesg-all-bounces@mailman.ccsds.org] <b>On Behalf Of </b>Shames, Peter M (312G)<br><b>Sent:</b> 24 September 2014 20:07<br><b>To:</b> CCSDS Engineering Steering Group - CESG All<br><b>Subject:</b> [Cesg-all] Discussion about restarting SEA System Architecture Working Group (SAWG) for RASDS revision<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'>Dear CESG colleagues,<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'>We published the Reference Architecture for Space Data Systems (RASDS). Magenta Book. Issue 1, in September 2008. According to the CCSDS Procedures Manual, CCSDS A02.1-Y-4 , Sec 6.2.7, it is now time (past time actually) to perform the RASDS Periodic Review. We will need to restart the System Architecture Working group (SAWG) in order to carry out this work and will be discussing how best to do this within SEA.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'>There are several possible outcomes of this review:<o:p></o:p></span></p></div><ol start=1 type=1><li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'><span style='font-size:10.5pt;font-family:"Calibri","sans-serif"'>Reaffirm the document as it is<o:p></o:p></span></li><li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'><span style='font-size:10.5pt;font-family:"Calibri","sans-serif"'>Make minor technical changes<o:p></o:p></span></li><li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'><span style='font-size:10.5pt;font-family:"Calibri","sans-serif"'>Revise it by adding new material (such as a Service or Operations viewpoint)<o:p></o:p></span></li><li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'><span style='font-size:10.5pt;font-family:"Calibri","sans-serif"'>Revise it and re-cast using more modern SysML and UML methods to replace / augment the current PPT drawing approach<o:p></o:p></span></li><li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'><span style='font-size:10.5pt;font-family:"Calibri","sans-serif"'>Retire the document (Silver status)<o:p></o:p></span></li></ol><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'>Since the document is consistently in the upper 30-40 documents downloaded from the CCSDS web site, and it has been used by a number of different projects and documents both inside and outside CCSDS, it is probably pre-mature to retire it.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'>If we decide to take on either option 3 or 4 we understand that it will bear some relationship to other working groups in CCSDS. The Services and Operations viewpoints should be of use to the CSS, MOIMS, and SOIS. The use of SysML and UML will align the RASDS with the best current Model Based Systems Engineering (MBSE) practices and some of the WG are already using these methods.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'>I would like to solicit expressions of interest from the other WG's and the agencies that are represented in CCSDS. If you would like to contribute ideas, approaches, or support please contact me. We will discuss this within the SEA Plenary, but I would be willing to set up a separate BoF as well to allow more open discusison among interested parties from any WG.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'>Thanks, Peter<o:p></o:p></span></p></div></div></div><p class="gfidisc.scisys.co.uk" id="gfidisc.scisys.co.uk" style="gfidisc.scisys.co.uk"></p><a id="gfidisc.scisys.co.uk" title="gfidisc.scisys.co.uk" href="gfidisc.scisys.co.uk" class="gfidisc.scisys.co.uk" style="text-decoration: none !important;"></a><gfidisc.scisys.co.uk/><h1 class="gfidisc.scisys.co.uk" style="gfidisc.scisys.co.uk"></h1><p><span style="color: #0000ff; font-family: Tahoma; font-size: small;"> </span></p>
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