The 1971 Convention established an annual Most Improved Chapter Award to recognize major improvement in chapter development, including project work and headquarters reports, in one year as compared with previous years. Judging is by a committee of student delegates at the annual Convention, and the winners are announced. The 1983 Convention re-named the prize as the R.H. Nagel Most Improved Chapter Award.
Winners have been:
| Year | Winning Chapter | Honorable Mention |
|---|---|---|
| 1971-72 | Texas Beta | AZ A & WI A |
| 1972-73 | Colorado Beta | NY O |
| 1973-74 | Washington Alpha | NY G & TN A |
| 1974-75 | Utah Alpha | MD A & MI G |
| 1975-76 | Missouri Gamma | CA N & VT B |
| 1976-77 | Illinois Alpha | MO A & PR A |
| 1977-78 | New York Iota | NH A & CA O |
| 1978-79 | Minnesota Alpha | IL E & IN A |
| 1979-80 | Pennsylvania Alpha | UT A |
| 1980-81 | California Beta | ME A & WI A |
| 1981-82 | Massachusetts Epsilon | NY L |
| R.H. Nagel Most Improved Chapters | ||
| 1982-83 | Virginia Gamma | NE A, NY K, & WV B |
| 1983-84 | Florida Beta | MI I & NC D |
| 1984-85 | South Dakota Alpha | SC A |
| 1985-86 | New York Lambda | CA L |
| 1986-87 | Texas Delta | NY P |
| 1987-88 | DC Gamma | IA B & NC D |
| 1988-89 | New York Alpha | IL A |
| 1989-90 | California Kappa | CA T & TX H |
| 1990-91 | Tennessee Alpha | AZ G |
| 1991-92 | Florida Gamma | MO A & NH A |
| 1992-93 | Massachusetts Eta | AL A & KS A |
| 1993-94 | West Virginia Alpha | MN A |
| 1994-95 | New York Omicron | NY D |
| 1995-96 | New York Theta | IL D, KY B, & PA Q |
| 1996-97 | Florida Epsilon | RI A |
| 1997-98 | Massachusetts Delta | CA S & OH E |
| 1998-99 | Florida Beta | DC G & LA G |
| 1999-00 | Louisiana Gamma | CA G & MO B |
| 2000-01 | West Virginia Alpha | None |
| 2001-02 | Nevada Beta | NY N |
| 2002-03 | Kansas Beta | CA I, UT A, & UT B |
| 2003-04 | California Sigma | None |
| 2004-05 | Alabama Epsilon | FL G |
| 2005-06 | Arizona Alpha | TX Q |
| 2006-07 | New York Tau | None |
| 2007-08 | Pennsylvania Iota | TX A |
| 2008-09 | Minnesota Alpha | None |
| 2009-10 | Montana Alpha | MI L |