The Westland School Collection broadly documents a re-emergence of the progressive education movement mid-century, focusing on its development over a seventy year period in Los Angeles California. The collection includes founding documents and internal records, as well as material which focuses on the daily activities of students and staff. The collection has been divided into three series, Administrative Files and Publications (1949-2014), Student and Staff Life (1949-2010), and Official Portraits (1990-2007).

Series I, Administrative Files and Publications, documents the organization's founding and daily activities through bylaws, meeting minutes, procedural documents, forms, and correspondence. Also included are documents and photographic materials which detail school history, curriculum and program planning, marketing and public outreach, facilities development, construction, and renovation. The series is arranged alphabetically by topic.

Series II, Student and Staff Life, documents important events such as anniversaries, reunions, graduations, fairs, student work, creative play and performances, music, science and math activities, field trips, parent participation and special visitors. The series includes both records and photographic materials, and is arranged alphabetically by topic.

Series III, Official Portraits, consists of professional photographs, slides, and negatives of students and staff. The series is arranged by name and date where possible.