Question:  Peter Gwinn attended one of few liberal arts colleges that runs on what system?

Context paragraphs:
Massachusetts College of Liberal Arts: The Massachusetts College of Liberal Arts, also known as MCLA, is a public, residential, liberal arts college that offers both undergraduate and graduate programs.  Located in North Adams, Massachusetts, it is part of the state university system of Massachusetts.  It is a member of the Council of Public Liberal Arts Colleges.  Originally established as part of the state's normal school system for training teachers, it now offers a wide variety of programs leading to Bachelor of Science and Arts degrees, as well as a Master of Education track.

Wabash College: Wabash College is a small, private, liberal arts college for men, located in Crawfordsville, Indiana, United States.  Founded in 1832 by several Dartmouth College graduates and Midwestern leaders, Wabash is ranked in the top tier of national liberal arts colleges by "U.S. News & World Report".  Wabash is one of the country's three remaining male-only liberal arts colleges.

Carleton College: Carleton College ( ) is a private liberal arts college in the historic town of Northfield, Minnesota.  The college enrolled 2,014 undergraduate students and employed 245 instructional faculty members in fall 2015.  Carleton is one of few liberal arts colleges that runs on the trimester system.

Peter Gwinn: Peter Gwinn is an American comedy writer and improviser from Evanston, Illinois.  He attended Carleton College in Northfield, MN.  He was a member of The Second City Touring Company from 1997 to 2000.  He has taught at both the I.O. and Upright Citizens Brigade theaters and is the founder of the musical improv group Baby Wants Candy.  He is the author of the 2003 book, "Group Improvisation: The Manual of Ensemble Improv Games".  Gwinn was a staff writer for the TV political satire "The Colbert Report" until 2012-06-14.  He has made several on-screen appearances, as Jimmy the director, as a singer in a "Formula 401" sperm commercial and as a barbecue attendee.  He has also written and appeared on the 2013 TV series Alpha House, produced by Amazon Studios.

Annapolis Group: The Annapolis Group is an American organization of independent liberal arts colleges." It represents approximately 130 liberal arts colleges in the United States.  These colleges work together to promote a greater understanding of the goals of a liberal arts education through their websites, as well as through independent research.  Its current chair is Stephen D. Schutt, the president of Lake Forest College.

State University of New York at Purchase: State University of New York at Purchase also known as Purchase College is a public four-year college located in Purchase, New York, United States.  It is one of 13 comprehensive colleges in the State University of New York (SUNY) system.  Founded by Governor Nelson Rockefeller in 1967 as "the cultural gem of the SUNY system", Purchase College claims to offer "a unique education that combines programs in the liberal arts with conservatory programs in the arts in ways that emphasize inquiry, mastery of skills, and creativity."  Purchase College was ranked 9 in U.S. News & World Report's 2016 listing of top public liberal arts colleges.  The college was listed as one of Kiplinger's 100 Best Public College Values in 2016.  It was also listed in that publication's 2014 list of Best Values in Small Colleges.  The Princeton Review included Purchase College in its 2015 list of The Best 379 Colleges.

Liberal arts college: A liberal arts college is a college with an emphasis on undergraduate study in the liberal arts and sciences.  A liberal arts college aims to impart a broad general knowledge and develop general intellectual capacities, in contrast to a professional, vocational, or technical curriculum.  Students in a liberal arts college generally major in a particular discipline while receiving exposure to a wide range of academic subjects, including sciences as well as the traditional humanities subjects taught as liberal arts.  Although it draws on European antecedents, the liberal arts college is strongly associated with American higher education, and most liberal arts colleges around the world draw explicitly on the American model.

Consortium of Liberal Arts Colleges: The Consortium of Liberal Arts Colleges (CLAC) is a nonprofit organization of 70 American liberal arts colleges which formed in 1984 under the leadership of Oberlin College's president S. Frederick Starr.  CLAC brings together the IT professionals from its member colleges and universities to help those institutions make the best use of technology to enrich students’ learning, facilitate teaching and research, and to support the business of the higher education.  CLAC has been supporting collaboration, knowledge sharing, professional growth of its IT members, and advocacy for the liberal arts at the national level for more three decades.

Nazarene International Education Association: The Nazarene International Education Association (NIEA) is a part of the Church of the Nazarene.  The Church of the Nazarene owns and operates 11 liberal arts institutions in Africa, Canada, Korea, and the United States, as well as 3 graduate seminaries, 37 undergraduate Bible/theological colleges, 3 nurses training colleges, 1 junior college, and 1 education college worldwide.  At least in terms of the American institutions, the Church of the Nazarene seems to have changed its original official philosophy of abandoning academies, bible colleges, and universities to focus on liberal arts colleges, as 7 of the 8 "liberal arts colleges" call themselves universities, and there is now a bible college in Colorado Springs.  The early-twentieth-century philosophy, as expressed by J.B. Chapman:It was originally the plan to call every school we started a “university” ... It was our ultimate aim to have universities and our schools were named according to our vision of future developments.  But I am, personally, convinced that we should definitely abandon the idea of building any universities, that we should drop these names from our schools... [Moreover,] it is my conclusion that we ... cannot permanently maintain academies and they do not meet our need, that a special Bible school does not meet our needs and that we should express ourselves on this conviction... That the College, with the necessary fitting school and Bible department[,] is the school that we need and will build."

List of liberal arts colleges: Liberal arts colleges are primarily colleges or universities with an emphasis upon undergraduate study in the liberal arts.  The "Encyclopædia Britannica Concise" offers the following definition of the liberal arts as a, "college or university curriculum aimed at imparting general knowledge and developing general intellectual capacities, in contrast to a professional, vocational, or technical curriculum."  Although the genesis for what is known today as the liberal arts college began in Europe, the term is commonly associated with the United States.  Liberal arts colleges are found in countries all over the world as well.  See the list (link) of international members of the Association of American Colleges and Universities for other institutions offering liberal arts education programs.

Supporting paragraphs: Peter Gwinn Carleton College
Answer: trimester system