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| 1921 | Courses in bookkeeping, typing, and advertising are offered in the newly established Commercial Department. |
| 1921 | Nicholas Ricciardi is selected president by the Board of Trustees. |
| 1921 | The local Board of Trustees is disbanded and control is transferred to the State Board of Education. |
| 1923 | A four-year course of study in printing begins. |
| 1923 | Drastic budget cuts force a reduction in the number of classes offered. Only classes in agriculture, mechanics and printing remain. Nine female students enroll in printing classes after their former courses of study are eliminated. |
| 1924 | Margaret Chase, vice president of the school, is appointed acting president for the remainder of the academic year after the resignation of Nicholas Ricciardi. |
| 1924 | A committee of 15 local citizens is formed to study the school's objectives and direction. |
| 1924 | The San Luis Obispo Local Committee of Fifteen and the State Board of Education choose Benjamin R. Crandall as president. |
| 1925 | Enterprise projects are established for agriculture students, who spend mornings in class and afternoons on their projects. "Earn while you learn" is the motto for the program. A Junior Farm Center Loan Fund, forerunner of today's Foundation, is established to provide students with financial aid for projects. |
| 1926 | Classes in the Academic, Household Arts, and Commercial Departments are restored. |
| 1927 | The school adds a two-year Junior College Division to the four-year secondary vocational program. Engineering/Mechanics is the principal course of study. Aeronautics is also offered. |
| 1927 | The name Cal Poly comes into popular use. |
| 1929 | Women students are excluded from attending Cal Poly by legislative act beginning in 1930 because of lack of on-campus housing for women. |
