| 1 | A | B | C | D | E |
| --- | --- | --- | --- | --- | --- |
| 2 | Robert's Rules of Order - Official editions |  |  |  |  |
| 3 | Title | Edition | Year | Authors (posthumous authorial credit in italics) | Publisher |
| 4 | Pocket Manual of Rules of Order for Deliberative Assemblies: Robert's Rules of Order | First | 1876 | Major Henry M. Robert | S. C. Griggs & Company |
| 5 | Pocket Manual of Rules of Order for Deliberative Assemblies: Robert's Rules of Order | Second | 1876 | Major Henry M. Robert (Lieut. Colonel in later printings) | S. C. Griggs & Company |
| 6 | Pocket Manual of Rules of Order for Deliberative Assemblies: Robert's Rules of Order | Third | 1893 | Lieut. Colonel Henry M. Robert (Colonel, then General in later printings) | S. C. Griggs & Company (Scott, Foresman and Company in later printings) |
| 7 | Robert's Rules of Order Revised | Fourth | 1915 | General Henry M. Robert | Scott, Foresman and Company |
| 8 | Robert's Rules of Order Revised | Fifth | 1943 | General Henry M. Robert (Editors: Isabel H. Robert and Sarah Corbin Robert, Trustee) | Scott, Foresman and Company |
| 9 | Robert's Rules of Order Revised | Sixth | 1951 | General Henry M. Robert (Editors: Isabel H. Robert and Sarah Corbin Robert, Trustee) | Scott, Foresman and Company |
| 10 | Robert's Rules of Order Newly Revised | Seventh | 1970 | General Henry M. Robert and Sarah Corbin Robert with the assistance of Henry M. | Scott, Foresman and Company |
| 11 | Robert's Rules of Order Newly Revised | Eighth | 1981 | General Henry M. Robert and Sarah Corbin Robert with the assistance of Henry M. | Scott, Foresman and Company |
| 12 | Robert's Rules of Order Newly Revised | Ninth | 1990 | General Henry M. Robert and Sarah Corbin Robert with the assistance of Henry M. Robert III and William J. Evans | Scott, Foresman and Company |
| 13 | Robert's Rules of Order Newly Revised | Tenth | 2000 | General Henry M. Robert, Sarah Corbin Robert, Henry M. | Perseus Books |
| 14 | Robert's Rules of Order Newly Revised | Eleventh | 2011 | General Henry M. Robert, Sarah Corbin Robert, Henry M. | Da Capo Press, A Member of the Perseus Books Group |

Question: When was the last time that Robert's Rules of Order is revised?
Answer: The Eleventh edition of the series was published in 2011 under the title Robert's Rules of Order Newly Revised.