Question: Which institution of higher education consists of more separate establishments, Grinnell College or Texas Tech University System?
Context: Grinnell College is a private liberal arts college in Grinnell, Iowa, U.S., known for its rigorous academics and tradition of social responsibility.  It was founded in 1846, when a group of New England Congregationalists established the Trustees of Iowa College. The Texas Tech University Health Sciences Center (TTUHSC) offers programs in health professions, biomedical sciences, medicine, nursing, and pharmacy.  TTUHSC is a multi-campus institution based in Lubbock with additional campuses located in Abilene, Amarillo, Dallas, El Paso and the Permian Basin.  TTUHSC serves more than 100 counties in the western portion of Texas.  The university is a separate institution from Texas Tech University; both universities are among four universities that are part of the Texas Tech University System. The Texas A&M–Texas Tech football rivalry was an American college football rivalry between the Texas A&M Aggies football team of Texas A&M University and Texas Tech Red Raiders football team of Texas Tech University.  The series began in 1927.  The rivalry had continued uninterrupted since 1957 when the two schools became conference rivals.  Texas A&M leads the series 37–32–1.  Texas A&M started the series with a 12–3 advantage while the two teams played each other as non-conference opponents from 1927–1955.  Texas Tech took a 2–1 record during its probationary membership in the Southwest Conference from 1957–59.  Texas A&M led the series during the Southwest Conference years (1960–95) with an 18–17–1 record.  Texas Tech led the series during the Big 12 Conference years (1996–2011) with a 10–6 record.  Both teams are tied with six games each for the longest winning streak.  Texas Tech holds the longest uninterrupted winning streak of the series, six games between 1968 and 1973, while Texas A&M has the longest nonconsecutive winning streak, six games in 1927, 1932 and 1942 through 1945.  Texas A&M currently holds a three-game winning streak but with their departure from the Big 12 Conference in 2012, it is uncertain if the rivalry will continue in the future. Texas Tech University, often referred to as Texas Tech, Tech, or TTU, is a public research university in Lubbock, Texas.  Established on  10, 1923 (1923--) , and originally known as Texas Technological College, it is the flagship institution of the four-institution Texas Tech University System.  The university's student enrollment is the sixth-largest in Texas as of the Fall 2014 semester.  The university shares its campus with Texas Tech University Health Sciences Center, making it the only campus in Texas to house an undergraduate university, law school, and medical school. Texas Tech University, often referred to as Texas Tech or TTU, is a public, coeducational, research university located in Lubbock, Texas.  Established on February 10, 1923, and originally known as Texas Technological College, it is the leading institution of the Texas Tech University System and has the sixth largest student body in the state of Texas.  It is the only school in Texas to house an undergraduate institution, law school, and medical school at the same location.  Initial enrollment in 1925 was 910 students; as of 2009, the university has 30,049 students from more than 110 countries, all 50 U.S. states and the District of Columbia.  Since the university's first graduating class in 1927 of 26 students, Texas Tech has awarded more than 221,000 degrees, including 45,000 graduate and professional degrees to its alumni.  The Texas Tech Alumni Association, with over 27,000 members, operates more than 120 chapters in cities throughout the United States and the world. Texas Tech University College of Education is a college at Texas Tech University in Lubbock, Texas.  The education program has existed at Texas Tech University since 1925.  The college is accredited by the National Council for Accreditation of Teacher Education. The College of Education at Louisiana Tech University is one of the five colleges comprising Louisiana Tech University.  The mission of the College traces back to the origins of Louisiana Tech in 1894, where the preparation of teachers was a mission of the institution.  Today, the College of Education consists of three separate departments awarding thirty-five different academic degrees ranging from the baccalaureate to the doctoral levels. Education in Vietnam is a state-run system of public and private education run by the Ministry of Education and Training.  It is divided into five levels: preschool, primary school, secondary school, high school, and higher education.  Formal education consists of twelve years of basic education.  Basic education consists of five years of primary education, four years of intermediate education, and three years of secondary education.  The majority of basic education students are enrolled on a half-day basis.  The main education goal in Vietnam is "improving people’s general knowledge, training quality human resources, and nurturing and fostering talent." The Texas Tech University System is a state university system in Texas consisting of four separate universities in the state of Texas, of which two are academic institutions: Angelo State University and Texas Tech University, and two are health institutions: Texas Tech University Health Sciences Center, and Texas Tech University Health Sciences Center at El Paso.  The System is headquartered in the Administration Building on the Texas Tech University campus in Lubbock, Texas. Kent Ronald Hance (born November 14, 1942) is the former Chancellor of the Texas Tech University System.  In his role, he oversaw Texas Tech University, Texas Tech University Health Sciences Center and Angelo State University in San Angelo, Texas.  He is also a lobbyist and lawyer who was a Democratic member of the United States House of Representatives from West Texas, having served from 1979 to 1985.  After his congressional service, he switched to the Republican Party and in 1990 made an unsuccessful primary race for governor of Texas.
Answer: Texas Tech University System