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Plano Senior High School (commonly Plano, Plano Senior High, or PSHS) is a public secondary school in Plano, Texas, serving students in grades 11–12. The school is part of the Plano Independent School District, with admission based primarily on the locations of students' homes. Plano is a two time Blue Ribbon School and a Texas Exemplary School. Students at Plano Senior typically attended one of two feeder high schools: Clark or Vines. Founded in 1891 as Plano Public School, serving both primary and secondary students, the school was, by the mid 1910s, sending a majority of its graduating students on to college. Plano High School, created in 1952 by separating the primary students into Mendenhall Elementary School, was immediately accredited by the Southern Association of Colleges and Schools, allowing its graduates to enter college without taking an entrance exam. In 1964, Plano High School integrated with the Frederick Douglass School (formerly Plano Colored School), and the integrated football team won the first of the school's seven state championships in 1965. In 1975, the school moved to a new campus with five buildings, very similar to the layout of a junior college, where it has remained since. The old building is now the T. H. Williams High School, serving 9th and 10th grade. During the first year only at the new campus, PSHS served 10th – 12th grade, making the Class of 1978 the only class to attend school at this campus for three years. Plano administers more Advanced Placement tests each year than any other school west of the Mississippi River and all but one school in the United States. The school is accredited by the Texas Education Agency as well as the Southern Association of Colleges and Schools. Plano was ranked in the top 2,000 high schools in the United States in 2013. Plano's mascot is the Wildcat. In 2013 Plano was ranked 117th in Newsweek's review of America's Best High Schools. As of the 2012–2013 school year, the school had an enrollment of 2,627 students and 149.54 classroom teachers (on an FTE basis), for a student teacher ratio of 17.57:1. and for the purchase of the Plano Institute's land and building. The building was used for the new Plano Public School, from which Plano Senior High School would develop. Thus, 1891 is generally considered the school's foundation year. The original school grounds would later become the Cox Administration Building. The original building burned down in 1894 and was reconstructed on the same site. The rebuilt Plano Public School again burned down in the spring of 1903, leading to the construction of yet another new building. The students went to classes in the local Opera House until the completion of the new building, often called the "Spanish School" because of its Moorish architecture. Following its construction, the district built various new facilities to support its students, including a new band hall, gymnasium, and auditorium. Following the 1954 U. S. Supreme Court decision Brown v. Board of Education, the Plano school board considered the issue of integrating Plano High School with Plano Colored High School. The school board formed a committee of "colored citizens" to address the concern. Twice, in 1955 and 1957, when asked if they favored integration, the citizens on the committee stated they "were perfectly happy with their school and would like to be left alone." In 1964, the issue was raised again when the school board voted to let students of the Plano Colored School, by then renamed the Frederick Douglass School, decide if they wanted to integrate with Plano High School. The students voted to integrate, and Douglass School became a primary facility. The 1964–1965 football team, the first integrated team for the school, won the first state championship in school history, helping to ease racial tensions. By 1968, Douglass School was closed. The Texas Education Agency later praised the district for its handling of integration, calling it "an exceptional job." This system allows students to complete most of their required credits in high school and specialize with vocational classes at the senior high.

The current campus dates from 1975. The plan created a site with five buildings, very similar to the layout of a junior college. The campus now contains six buildings with the addition in 2002 of an indoor workout facility. The buildings are interconnected by greenspace, which features a man made pond as the central element. The campus was constructed at a cost of 10.3 million U. S. dollars (42.7 million 2010 dollars).

In the 2012–2013 school year, the demographic breakdown of the 2,627 students enrolled, was: with the exception of Latin Literature, Italian Language and Culture, and Japanese Language and Culture. Yearly, the school administers more Advanced Placement tests than any other school west of the Mississippi River, and the second most tests in the United States (2,237 total exams in the year 2005). In the 2007 graduating class, 97% of graduates went on to college or university: 80% went on to four year universities, while 17% went to two year colleges. Students in the class achieved an average composite SAT score of 1163 out of 1600 and a mean composite ACT score of 24.7 out of 36. Many Plano students received National Merit Scholarship accolades in the 2007 school year, including 46 finalists, 54 semi finalists, and 62 commended students.

The extracurricular activities offered at Plano Senior High School are many and varied due to the school's large size. There are chapters of national organizations, such as the National Honor Society, and clubs founded by Plano students, such as Acoustical Word, in which students play guitar and recite poetry. Service organizations such as Key Club coexist alongside clubs which have a primarily social or recreational purpose. The usual range of athletic and music organizations are there for students to join, in addition to Plano's other clubs. Plano Senior High School teams currently compete in UIL competitions in District 6 of the 6A Class, the class designated for the largest schools. For the 2008–2010 school years, Plano competed in District 8 5A. Plano's 2007 enrollment for competitive purposes is officially listed as 5240. This is the number used by the UIL when determining what other schools Plano competes against in all UIL sponsored athletic and academic competitions. This number exceeds the on site enrollment of Plano Senior High because the official enrollment of each senior high school also includes the enrollment of each of its feeder schools. Ninth and tenth graders who are good enough to compete at the varsity level of a sport may be bused to the senior high school to compete in varsity sports, therefore becoming part of the senior high's talent pool. The number can be fractional because Jasper High School, one of Plano's feeder schools, is also a feeder school for Plano West Senior High School, and therefore the enrollment is split.

The 2006 state champion Plano Academic Decathlon team represented Texas at the national competition in San Antonio, Texas, placing second. The team won 30 medals in subject, overall, and team scores.

At the 2005 National Forensic League national tournament, the Plano Senior Speech Team received School of Excellence awards in both the Speech and Debate categories, one of only three schools that year to do so. The team also won the 2005 national title at the Princeton University tournament. At the 2007 National Speech Tournament, Plano students won the sixth place Sweepstakes Trophy. In 2006 and 2009, the school finished 2nd in the annual National Public Policy Forum (NPPF) debate tournament held in New York City and hosted by the Bickel & Brewer law firm and New York University. In 2011, the school finished 1st in the same competition gone international (the IPPF) hosted by Bickel & Brewer and NYU.

Plano Senior High was named by the Grammy Foundation as a 2005 Grammy Signature School Gold school for their achievement in the arts. In 2008, Plano Senior High School was once again one of two schools in the nation to be named a Grammy Signature School Gold.

The Plano Senior High School Varsity Women's Choir was named a TMEA Honor Choir in 2009. In 2012, the Plano Senior High School A Cappella Mixed Choir was announced to represent the state of Texas at ACDA. In 2016, it was announced that the Plano Senior High School Varsity Women's Choir would once again be named as a TMEA Honor Choir at the 2017 convention. In addition, the Plano Senior High School Varsity Men's Choir represented the state of Texas at ACDA in 2017.

An unofficial band was first organized in 1935. In 1955, Plano hired University of Arkansas graduate Emmitt Clem, who led the band for twenty one years and wrote the school song. The band performed pre game for the first Dallas Cowboys season and at a nationally televised Cowboys game at the Cotton Bowl in 1962. In June 1976 the Plano band traveled to Washington DC and played on the steps of the US Capitol during national bicentennial events. The band performed in the 1977 State high school championship football game at Texas Stadium where Plano beat Port Neches Groves 13–10. Doc Severinsen, band leader of The Tonight Show Starring Johnny Carson, visited the high school annually to play with the band. In 2007, The Plano Wind Ensemble was named a 5A National Wind Honor Band, ranking them fifth in the nation. The Jazz Band at Plano was chosen to attend the Essentially Ellington Competition in New York City in both 2005 and 2010.

The Plano Senior High Full Orchestra (composed of the best winds and strings at the school) was named Texas' Honor Full Orchestra in 2007, 2009, 2012, and 2015. Plano's String Orchestra was selected as the TMEA honor orchestra in 1993, 1995 and 1998. In 1995, the Orchestra played at Carnegie Hall.