The IEEE 802.16 Working Group on Broadband Wireless Access Standards

This news page has not been maintained since 2002.

Please refer to the IEEE 802.16 Session Reports.

"Ancient News"

20 November 2002
This news is quite out of date. See the Session #21 and Session #22 Reports for recent information.
11 September 2002
IEEE LMSC Sponsor Ballot of IEEE P802.16c/D3-2002 closed. The draft was approved (pending resolution of comments)
4 September 2002
IEEE LMSC Sponsor Ballot of IEEE P802.16a/D5-2002 closed. The draft was approved (pending resolution of comments)
23 August 2002
Call for Contributions issued by IEEE 802.16 Mobile Wireless MAN Study Group
19 August 2002
Working Group Letter Ballot #8 opened, reviewing P802.16.2a/D1-2002
19 August 2002
Call for Contributions issued by Task Group C1 (developing 10-66 GHz PICS)
15 August 2002
The IEEE-SA Standards Board approved PAR 1802.16.1 to develop a Protocol Implementation Conformance Statement (PICS) for the 10-66 GHz WirelessMAN-SC air interface. The project was assigned to a new Task Group C1
15 August 2002
The IEEE-SA Standards Board approved a revised PAR 802.16.2a
13 August 2002
IEEE LMSC Sponsor Ballot of IEEE P802.16c/D3-2002 opened, until 11 September.
7 August 2002
Working Group Confirmation Ballot #6a closes, resulting in final Working Group approval of IEEE P802.16a/D2-2002. Draft 3 (editorial revision of Draft 2) submitted for IEEE LMSC Sponsor Ballot
6 August 2002
Call for Contributions issued by 802.16a Enhancements Ad Hoc Committee
6 August 2002
IEEE LMSC Sponsor Ballot of IEEE P802.16a/D5-2002 opened, until 4 September.
5 August 2002
IEEE-SA New Standards Committee (NesCom) approved PAR 1802.16.1 to develop a Protocol Implementation Conformance Statement (PICS) for the 10-66 GHz WirelessMAN-SC air interface. A change to the 802.16.2a PAR was also approved. Final IEEE-SA Standards Board action is scheduled for 15 August.
4 August 2002
Working Group Confirmation Ballot #7a closes, resulting in final Working Group approval of IEEE P802.16a/D5-2002
30 July 2002
802.16a Enhancements Ad Hoc Committee Chair Designated
30 July 2002
IEEE 802.16 Mobile WIreless MAN Study Group Chair and Vice Chair Designated
23 July 2002
Working Group Confirmation Ballot #6a opened, reviewing IEEE P802.16c/D2-2002
20 July 2002
Working Group Confirmation Ballot #7a opened, reviewing IEEE P802.16a/D5-2002
12 July 2002
The 802 SEC granted "conditional approval" to forward the P802.16a and P802.16c drafts for Sponsor Ballot.
12 July 2002
The 802 SEC agreed to forward a Working Group Project Authorization Request to initiate a new project, numbered P1802.16.1, for a Protocol Implementation Conformance Statement (PICS) for the 10-66 GHz WirelessMAN-SC air interface.
11 July 2002
The Working Group initiated the IEEE 802.16 Mobile WIreless MAN Study Group; this group will address enhancements to the IEEE 802.16a PHY/MAC to support mobile operation.
8-11 July 2002
Session #20 was held in Vancouver, British Columbia, Canada. The Session #20 Report provides the details.
2 July 2002
Working Group Letter Ballot #7 closed
28 June 2002
Working Group Letter Ballot #6 closed
28 May 2002
Working Group Letter Ballot #7 opened, reviewing IEEE P802.16a/D4-2002
24 May 2002
Working Group Letter Ballot #6 opened, reviewing IEEE P802.16c/D1-2002
24 May 2002
The Working Group completed a Project Authorization Request to initiate a new project, tentatively numbered P1802.16.1, to contain a Protocol Implementation Conformance Statement (PICS) for the 10-66 GHz WirelessMAN-SC air interface. The PAR was submitted to the IEEE 802 Sponsor Executive Committee for July approval.
24 May 2002
The Working Group decided to hold Session #20 in Cheju, Korea on 23-27 September 2002.
20-24 May 2002
Session #19 was held in Calgary, Alberta, Canada, hosted by Shawn Taylor, Wi-LAN Inc. The Session #19 Report provides the details.
17 May 2002
Working Group Letter Ballot #5 closed
15 April 2002
Call for Contributions on Mergers and Consolidation: IEEE Project 802.16a
12 April 2002
Working Group Letter Ballot #5 opens
12 April 2002
802 SEC denies request to open Sponsor Ballot on P802.16a
10 April 2002
IEEE Std 802.16.2 offered as a free download
09 April 2002
IEEE finalizes Sponsor Ballot Group for P802.16a
08 April 2002
IEEE Standard 802.16 published
04 April 2002
Working Group Confirmation #4b closes
29 March 2002
P802.16/D3 offered for sale in IEEE catalog
26 March 2002
Call for Contributions regarding P802.16c
25 March 2002
P802.16/D3 issued; Working Group Confirmation #4b opens
25 March 2002
PAR 802.16c forwarded to IEEE-SA NesCom
22 March 2002
IEEE closes Invitation to Ballot on P802.16a
15 March 2002
802.16 and 802 approved forwarding of PAR 802.16c to NesCom
11-15 March 2002
Session #18 was held in St. Louis, MO, USA. The Session #18 Report provides the details.
07 March 2002
Recirculation Ballot #4a Reply Comment Period closed
26 February 2002
P802.16/D2 offered for sale in IEEE catalog
25 February 2002
Recirculation Ballot #4a Reply Comment Period opens
25 February 2002
Working Group Recirculation Ballot #4a closed
21 February 2002
IEEE issues Invitation to Ballot on P802.16a
14 February 2002
IEEE-SA Standards Board approves merger of 802.16b PAR into 802.16a
08 February 2002
Issued P802.16/D2 and initiated WG Recirculation Ballot #4a
07 Feb 2002
Draft PAR 802.16c submitted to IEEE 802 SEC
04 February 2002
Request that IEEE issue Invitation to Ballot on P802.16a
04 February 2002
IEEE-SA NesCom approves merger of PAR 802.16b into 802.16a
24 January 2002
Working Group Letter Ballot #4 declared passed, pending comment resolution and recirculation.
21-25 January 2002
Session #17 was held in Levi, Finland. The Session #17 Report provides the details.
16 January 2002
Reply Comment Period in Working Group Letter Ballot #4 closed.
7 January 2002
Reply Comment Period opened following Working Group Letter Ballot #4.
4 January 2002
Working Group Letter Ballot #4 closed. See the details.
6 December 2001
IEEE Standard 802.16 is now an IEEE Standard, following approval by the IEEE-SA Standards Board on 6 December 2001. See the press release (or the IEEE version) for more details. Until publication, the final balloted draft remains available in IEEE Catalog.
5 December 2001
Standards Review Committee (RevCom) of the IEEE-SA Standards Board recommends approval of IEEE P802.16/D5 by the full board as IEEE Standard 802.16.
30 November 2001
Working Group Letter Ballot on P802.16a/D1 opens; runs through 4 January 2002.
16 November 2001
IEEE 802 SEC passes motion to affirm submission of P802.16/D5 to RevCom.
16 November 2001
The Working Group (with the concurrence of IEEE 802 Executive Committee) approved a merger of Project P802.16b into an expanded P802.16a.
16 November 2001
A Working Group motion elevated P802.16a/D1 to Draft Standard status, with a Working Group Letter Ballot to start the week of 26 November.
12-16 November 2001
Session #16 was held in Austin, Texas, USA. The Session #16 Report provides the details.
7 November 2001
A Letter from ETSI BRAN informed IEEE 802.16 that, following consideration of several base-line proposals (based on IEEE 802.16, BWIF, and DVB-RCT), its HIPERMAN group has decided to choose, as its MAC baseline, the MAC-related clauses from IEEE P802.16/D5-2001 and IEEE P802.16ab-01/01r2. The same group made a "working assumption" that its baseline PHY would be the OFDM PHY from IEEE P802.16ab-01/01r2. ETSI BRAN noted that "These conclusions were motivated by the goal to provide one interoperable worldwide standard for the 2-11 GHz licensed bands."
2 November 2001
Reply-Comment Resolution Phase of Working Group Review underway through 8 November
2 November 2001
Reply-Comment Phase of Working Group Review closes
28 October 2001
Ballot of IEEE P802.16 WirelessMANTM Air Interface Closes Successfully
28 October 2001
Confirmation Ballot of IEEE P802.16 WirelessMANTM Air Interface Closes
26 October 2001
New P802.16a&b Ballot Schedule shows complete timeline through final approval
22 October 2001
Reply-Comment Phase of Working Group Review underway through 2 November
22 October 2001
IEEE P802.16 WirelessMANTM Air Interface (Draft 5) now available in IEEE Catalog
19 October 2001
Working Group Review of 2-11 GHz document closed
19 October 2001
Confirmation Ballot of IEEE P802.16 WirelessMANTM Air Interface Opens
18 October 2001
Draft 5 of IEEE P802.16 WirelessMANTM Air Interface released
4 October 2001
Recirculation Ballot of IEEE P802.16 WirelessMANTM Air Interface Closed with 97% Approval
28 September 2001
Latest version of 2-11 GHz Working Document released; Working Group Review underway through 19 October
25 September 2001
Recirculation Ballot of IEEE P802.16 WirelessMANTM Air Interface Opens
10-14 September 2001
Session #15 was held in Denver, Colorado, USA. The Session #15 Report provides the details.
11 September 2001
IEEE P802.16 WirelessMANTM Air Interface Draft available for sale in IEEE catalog
10 September 2001
IEEE Std 802.16.2 published by IEEE
09 September 2001
IEEE P802.16 WirelessMANTM Air Interface Completes IEEE Sponsor Ballot
27 August 2001
Comments collected in Final Task Group Review of 802.16a/802.16b Working Document
17 August 2001
Project Authorization Request P802.16.2a, to enhance 802.16.2, approved by IEEE-SA Standards Board
10 August 2001
IEEE P802.16 WirelessMANTM Air Interface Proceeds to IEEE Sponsor Ballot
09 August 2001
IEEE 802 Sponsor Executive Committee forwards P802.16 for Sponsor Ballot
04 August 2001
Open of IEEE 802 SEC Email Ballot motion to forward P802.16/D4-2001 for Sponsor Ballot
03 August 2001
P802.16/D4 Approved by Working Group as Letter Ballot Concludes Successfully
02 August 2001
IEEE 802.16 Confirmation Ballot #3b closed.
30 July 2001
802.16a/802.16b Working Document released; in Final Task Group Review through August 27
23 July 2001
Confirmation Ballot #3b began on IEEE P802.16/D2-2001.
13 July 2001
The Sponsor Executive Committee of the IEEE LAN MAN Standards Committee approved the initiation of a Sponsor Ballot (the final balloting stage) of the base 802.16 draft, conditional on successful completion of a confirmation ballot. The Working Group expects to initiate Sponsor Ballot by early August and continues to expect publication of the standard in the fourth quarter of 2001.
13 July 2001
The Sponsor Executive Committee of the IEEE LAN MAN Standards Committee approved Project Authorization Request P802.16.2a to initiate work to enhance Recommended Practice 802.16.2 by including licensed bands from 2-11 GHz and expanding the recommendations for coexistence of point-to-multipoint with point-to-point communications at millimeter-wave bands. The request has been forwarded to the IEEE Standards Board for final approval, which is expected on August 16.
9-13 July 2001
Session #14 was held in Portland, Oregon, USA. The Session #14 Report provides the details.
06 July 2001
Document IEEE 802.16.2/D3-2001 ("Recommended Practice for Coexistence of Broadband Wireless Access Systems") was formally approved by the IEEE-SA Standards Board.
14 June 2001
Document IEEE 802.16.2/D3-2001 ("Recommended Practice for Coexistence of Broadband Wireless Access Systems") was approved by the IEEE-SA Standards Board. The approval was conditional on completing a few formalities.
7-8 June 2001
Task Groups 3 and 4 held an editorial meeting to unite their working documents.
14-18 May 2001
Session #13 was held in Orlando, Florida, USA. The Session #13 Report provides the details.
4 May 2001
Document IEEE 802.16.2/D3-2001 ("Recommended Practice for Coexistence of Broadband Wireless Access Systems") was submitted for approval to the IEEE-SA Standards Board's Review Committee. The document was in the final stages of Sponsor Ballot, which it completed, with 100% approval, on 16 May 2001.
20 March 2001
IEEE-SA News Release: IEEE 802.16 Group Achieves Key Milestones
17 March 2001
IEEE 802.16 is now working to create a unified Working Group air interface document with a common, flexible medium access control (MAC) platform supporting multiple physical layers (PHYs). The base document, entitled IEEE 802.16, will include the basic MAC and the 10-66 GHz PHY. Amendment 802.16a will include enhancements for 2-11 GHz licensed bands, and Amendment 802.16b will include enhancements for license-exempt operation. The new project alignment was given final approval by the IEEE-SA Standards Board following a decision by the Working Group on 12 March, approved by the IEEE 802 Executive Committee on 15 March and the IEEE-SA New Standards Committee on 16 March.
12-15 March 2001
Session #12 was held in Hilton Head, South Carolina, USA. 178 people attended. The session was marked by final agreement to create a unified Working Group air interface document with a common, flexible medium access control (MAC) platform supporting multiple physical layers (PHYs). The Session #12 Report provides the details.
15 March 2001
IEEE Working Group 802.16 formed a Study Group to investigate future enhancements to "Coexistence of Broadband Wireless Access Systems". Phil Whitehead is the Chair.
14 March 2001
The 802.16a group agreed to incorporate both a single-carrier mode (based on 802.16.3c-01/32) and an OFDM mode (based on 802.16.3c-01/33r2). Drafting has been initiated on both PHY and MAC documents.
14 March 2001
Sponsor Ballot opened on "Coexistence of Broadband Wireless Access Systems", following 100% approval in Working Group Letter Ballot. The ballot will close on 12 April.
13 March 2001
Working Group Letter Ballot #3 closed. "Draft Standard Air Interface for Fixed Broadband Wireless Access Systems" was approved, pending comment resolution.
17 February 2001
IEEE 802.16 Recirculation Ballot #2b closed, with 100% approval of proceeding to Sponsor Ballot with "Coexistence of Broadband Wireless Access Systems".
07 February 2001
IEEE 802.16 Recirculation Ballot #2b seeks approval to close IEEE 802.16 Letter Ballot #2.
6 February 2001
"Draft Standard Air Interface for Fixed Broadband Wireless Access Systems" went to ballot as Working Group Letter Ballot #3 opened, with a closing date of 13 March.
30 January 2001
EE Times provided a full report on 802.16's Session #11 in the article IEEE group gains ground on wireless standards.
22-26 January 2001
Session #11 was held in Ottawa, Ontario, Canada. 167 people registered and attended. The session was marked by an agreement to create a unified Working Group air interface document, with a common, flexible MAC platform supporting multiple spectrum-dependent physical layers. The first stage (the 10-66 GHz physical layer and MAC to support it) was approved for a Working Group Letter Ballot. In the development of the 2-11 GHz physical layer, the focus was narrowed and consolidation is underway. The WirelessHUMANTM Task Group held its first formal meetings to address licensed-exempt operations and found general consensus. A Recommended Practice on Coexistence was readied for Sponsor Ballot (its final round of balloting). The Session #11 Report provides the details.
20 January 2001
IEEE 802.16 Recirculation Ballot #2a closed.
18 January 2001
IEEE 802.16 held a "Meet and Greet" session, handing out literature and showing current drafts, at the 7th Annual Technical Symposium of the Wireless Communications Association.
16 January 2001
IEEE-SA News Release: New IEEE WirelessHUMANTM Project Developing Standards for Fixed Wireless Access in License-Exempt Bands
10 January 2001
IEEE 802.16 Recirculation Ballot #2a seeks to approve resolution of the comments received in IEEE 802.16 Letter Ballot #2.
2 January 2001
Task Group 1 issued a Call for Comments on IEEE 802.16.1/D1-2000 with a deadline of 16 January.
30 December 2000
Task Group 1 issued Draft 1 of its Draft Standard for Air Interface for Fixed Broadband Wireless Access Systems (IEEE 802.16.1/D1-2000). The file is password-protected.
27 December 2000
Document IEEE 802.16.2/D1-2000 ("Recommended Practice for Coexistence of Broadband Wireless Access Systems") was approved, pending comment resolution and recirculation, in IEEE 802.16 Letter Ballot #2
15 December 2000
Five focused 802.16 email reflectors have been launched, for TG1, TG2, TG3, TG4, and the MAC. Details are available.
14 December 2000
Task Group 3 issued a Call For Contributions on Proposed MAC Enhancements, Key Characteristics, and Evaluation Criteria with a 17 January deadline.
12-14 December 2000
Task Group 1 Only held a Session #10.5 in San Diego, CA, USA.
7 December 2000
The IEEE-SA Standards Board approved 802.16's WirelessHUMANTM PAR for License-Exempt Bands. Task Group 4 has issued a Call for Contributions with a deadline of 13 January 2001.
2 December 2000
Task Group 3 issued an Invitation To Contribute PHY Proposals with a 17 January deadline.
21 November 2000
The Session #10 Report was published.
20 November 2000
IEEE-SA News Release: IEEE 802.16 Group Makes Key Decisions on Fixed Broadband Wireless Access
17 November 2000
The Draft Recommended Practice for Coexistence of Broadband Wireless Access Systems went to ballot as Working Group Letter Ballot #2 opened, with a closing date of 27 December 2000.
6-9 November 2000
Session #10 was held in Tampa, Florida, USA. 211 people attended. A report is available.
25-26 October 2000
An Interim Meeting of TG2 (Coexistence Task Group) was held in Ottawa, Ontario, Canada.
2 October 2000
802.16 initiated a Marketing Committee, with Dean Chang of Aperto Networks as Chair.
1 October 2000
The 802.16 web site served up 432,351 file downloads during September. Revisions 1 and 2 of the IEEE 802.16.1 Air Interface for Broadband Wireless Access Systems (10-66 GHz) were downloaded 19749 times in August and September. Revisions 3 and 4 of the "Functional Requirements for the 802.16.3 Interoperability Standard" were downloaded 4329 times in August and September.
20 September 2000
The Session #9 Report was published.
11-15 September 2000
Session #9 was held in Denver, Colorado, USA. 144 people attended. 126 people attended during enough meeting intervals to receive credit for having "participated" in the session for membership purposes; this was just shy of the record 128 set at Session #8.
1 September 2000
The 802.16 web site served up 356,963 file downloads during August.
8 August 2000
Task Group 1 initiated a Final Task Group Review of the current version of the 802.16.1 Air Interface for Fixed Broadband Wireless Access Systems. The process is open to all, with comments due 1 September 2000. The intent is to use Session #9 to ready the document for a Working Group Letter Ballot.
1 August 2000
The 802.16 web site served up 350,020 file downloads during July.
25 July 2000
The IEEE Computer Society Standards Activities Board adopted the following motion: "Resolved that the IEEE Computer Society Standards Activities Board affirms the IEEE 802 Position Statement on IEEE 802.16 Broadband Wireless Access (BWA) Working Group Conflict of Interest with recent IEEE-ISTO announcement."
21 July 2000
IEEE 802.16 was mentioned in an EE Times article entitled Wireless Coalition Prompts IEEE Eruption.
20 July 2000
The Wireless Communications Association International (WCA) reported on the progress of 802.16 in an article entitled IEEE Groups Promote BWA Standards Planning, Dispute Overlapping Role.
17 July 2000
IEEE 802 issued a IEEE 802 Position Statement on IEEE 802.16 Broadband Wireless Access (BWA) Working Group Conflict of Interest with recent IEEE-ISTO announcement
21 July 2000
The Session #8 Report was published.
10-14 July 2000
Session #8 was held in La Jolla, California, USA. 165 people attended.
1 July 2000
IEEE's Computer Magazine (July 2000 issue) featured an article entitled "Broadband Fixed Wireless Travels the Last Mile" including a highlight box on "IEEE 802.16: A Fixed-Wireless Standard".
1 July 2000
The 802.16 web site served up 248,299 file downloads during June.
12-14 June 2000
802.16.2 Interim Meeting was held in Ottawa, Ontario, Canada.
2 June 2000
The 802.16 Working Group created Observer Status
1 June 2000
802.16.1 added a detailed MAC description to the invitation to a team of 36 individuals from 21 companies to present a unified MAC proposal at Session #8
1 June 2000
The 802.16 web site served up 230,777 file downloads during May. This was more than double the previous month.
30 May - 2 June 2000
802.16 Session #7.5 was held in Boulder, Colorado, USA; 18 people attended. This was a meeting only of the 802.16.1 Task Group, with a focus on the MAC.
8 May 2000
WirelessHUMANTM Study Group participated at IEEE 802.11/802.15 session in Seattle
5 May 2000
802.16.1 decided to meet on 30 May - 2 June 2000 in Boulder, Colorado, USA in Session #7.5.
5 May 2000
802.16 agreed to proposal for cooperation agreement with ETSI standardization group
4 May 2000
802.16.1 accepted plans to withdraw two MAC proposals and instead invite a unified MAC proposal from team of 36 individuals from 21 companies
4 May 2000
802.16.1 selected initial draft physical layer based on merged proposal submitted by team of 27 people from 20 companies
1-5 May 2000
Session #7 was held in Gaithersburg, Maryland, USA; 158 people attended. The HIPERACCESS group of ETSI BRAN held a co-located session, and joint meetings were held.
19-20 April 2000
802.16.2 Meeting was held in Montreal, PQ, Canada
18 April 2000
New 802.16 Patent Policy and Procedures and Contribution Release incorporated in Revision 8 of the IEEE 802.16 Document Submission Template and Presentation Submission Template
30 March 2000
802.16.3 Project was approved by the IEEE-SA Standards Board
9 March 2000
802.16.3 Task Group created by 802.16 to develop air interface for Licensed Frequencies from 2-11 GHz; project was approved by IEEE 802
9 March 2000
The new WirelessHUMANTM Study Group created for License-Exempt Bands
9 March 2000
New Regulatory Affairs Committee created.
6-9 March 2000
Session #6 held in Albuquerque, New Mexico, USA; 126 people attended
10-14 January 2000
Session #5 held in Richardson, Texas, USA; 119 people attended.
28 December 1999
IEEE 802.16 began formation of a Sponsor Balloting Pool. Future 802.16 draft standards will be balloted by a Balloting Group drawn from members of the Balloting Pool. Participation in 802.16 in not a requirement for becoming a member of the Balloting Pool or Balloting Group.
17 December 1999
IEEE 802.16 published 802.16.1 Functional Requirements, Rev. 1, which provides functional requirements for developing an interoperable 802.16.1 air interface. The document had been approved by 802.16 on November 11 during Session #4.
8-11 November 1999
Session #4 held in Koloa, Hawaii, USA
13-17 September 1999
Session #3 held in Boulder, Colorado, USA
4-6 August 1999
Session #2 held in Denver, Colorado, USA
6-8 July 1999
Session #1 held in Montreal, Quebec, Canada
10-12 May 1999
Session #0 held in Boulder, Colorado, USA
19 April 1999
IEEE-SA News Release: IEEE P802 LMSC Launches New Working Group, P802.16, on Broadband Wireless Access
15 April 1999
Final Report of the IEEE 802 Executive Committee Study Group on Broadband Wireless Access issued.
30 March 1999
802.16 email reflector "stds-802-16@ieee.org" goes on-line
22 March 1999
802.16 Web Site goes online
11 March 1999
IEEE 802.16 Working Group on Broadband Wireless Access created by IEEE 802. PAR for air interface (10-66 GHz) approved by IEEE 802.
9-11 March 1999
Second Session of IEEE 802 Study Group on Broadband Wireless Access. 54 people participated. Project Authorization Request (PAR) edited and submitted.
13-15 January 1999
First Session of IEEE 802 Study Group on Broadband Wireless Access, concurrently with meetings of IEEE 802.11 (Wireless LANs) and ETSI BRAN. Draft Project Authorization Request (PAR) developed.
12 November 1998
IEEE 802 creates Executive Committee Study Group on Broadband Wireless Access by unanimous vote.
10 November 1998
Nearly 50 people participated in an N-WEST Standardization Meeting held in conjunction with the Plenary Meeting of the IEEE "802" LAN/MAN Standards Committee.
9 November 1998
An N-WEST-organized Tutorial on Broadband Wireless Access Technology and Standards was presented to more 200 attendees at the IEEE "802" LAN/MAN Standards Committee Plenary Meeting.
9-10 August 1998
The N-WEST Kickoff Meeting was held, with 45 people in attendance.
For additional unofficial reports, see N-WEST News.
This news compiled by:

Roger Marks (r.b.marks@ieee.org)
Chair, IEEE 802.16 Working Group on Broadband Wireless Access Standards

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