Benjamin Bloom
Educational psychologist who developed Bloom's taxonomy and mastery learning.
Benjamin Samuel Bloom (February 21, 1913 – September 13, 1999) was an American educational psychologist and didactician. His work on classifying educational objectives and developing mastery learning theory shaped how educators around the world teach and think about learning, especially from the late twentieth century onward. His best-known achievement is Bloom's taxonomy, a system for describing, assessing, and categorizing educational outcomes.
Bloom was born in Lansford, Pennsylvania, to a Jewish family that had fled discrimination in Russia. He earned both a bachelor's and a master's degree from Pennsylvania State University in 1935, then received his doctorate from the University of Chicago in 1942 and joined its faculty in 1944. He served as president of the American Educational Research Association from 1965 to 1966.
In 1956, Bloom edited the first volume of *The Taxonomy of Educational Objectives: The Classification of Educational Goals*. This work introduced a rubric for classifying learning objectives—now called Bloom's taxonomy—and was one of the first systematic attempts to organize levels of cognitive functioning. It gave structure to the often vague mental processes of gifted students. A 1981 survey by Harold G. Shane and the National Society for the Study of Education identified it as a foundational text in the academic profession. Bloom is also credited with the "2 Sigma Problem."
Bloom studied student achievement and, with his colleagues, identified factors inside and outside school that affect learning. One factor was the lack of variation in teaching. He hypothesized that if teachers tailored their methods to each student, more children would learn effectively. This led to Bloom's Mastery Learning procedure. Teachers organized skills and concepts into units lasting one to two weeks. At the end of each unit, students took an assessment that gave constructive feedback. If a student struggled with key concepts, they received corrective assignments focused on those areas, then took a second assessment on the same skills. Students who showed mastery were given enrichment activities—such as academic games, reports, or special projects—chosen by the student themselves. This approach aimed to give each child individualized instruction at their own pace.
Bloom also led a research team that examined how exceptional talents develop, shedding light on vocational eminence and greatness. In a 1982 article, "The Role of Gifts and Markers in the Development of Talent," his team interviewed 70 individuals who were among the best in their fields—including mathematicians, Olympic swimmers, and concert pianists—along with their parents, teachers, and other key figures. The interviews aimed to identify special characteristics behind their success. Three traits appeared frequently: willingness to work, competitiveness, and ability to learn new techniques. The data also showed that when parents viewed their children as talented, they created environments that fostered growth—hiring tutors, providing competition opportunities, and offering encouragement. This belief in the child's talent, along with attention to a specific trait and any inherent gift, were considered "markers." These markers were seen as major reasons for the motivation and support from teachers and parents, which, combined with the individual's interest and work ethic, contributed to their success.
- born
- February 21, 1913
- died
- September 13, 1999
- field
- Educational psychology, didactics
- nationality
- American
- known_for
- Bloom's taxonomy, mastery learning, Bloom's 2 Sigma Problem
Lore & Background
Bloom was born in Lansford, Pennsylvania, to an immigrant Jewish family whose parents fled a climate of discrimination in Russia. He received a bachelor's degree from Pennsylvania State University in 1935 and a master's degree from Penn State, also in 1935. He received a doctorate from the University of Chicago in 1942 and joined its faculty in 1944. From 1965–1966, he served as president of the American Educational Research Association. In 1956, Bloom edited the first volume of The Taxonomy of Educational Objectives: The Classification of Educational Goals, which classified learning objectives according to a rubric that has come to be known as Bloom's taxonomy. It was one of the first attempts to systematically classify levels of cognitive functioning and gave structure to the otherwise amorphous mental processes of gifted students. Bloom's taxonomy remains a foundation of the academic profession according to the 1981 survey, 'Significant Writings That Have Influenced the Curriculum: 1906–81' by Harold G. Shane and the National Society for the Study of Education. Bloom's 2 Sigma Problem is also attributed to him. Bloom conducted research on student achievement, observing factors within and outside the school environment that affect how children learn. He hypothesized that if teachers adapted their teaching methods to individual needs, more children would receive the opportunity to learn better, leading to the creation of Bloom's Mastery Learning procedure. This procedure required teachers to organize skills and concepts into instructional units approximately 1–2 weeks in length, with assessments providing constructive feedback, corrective assignments for those lacking understanding, and enrichment activities for students showing mastery. Bloom also directed a research team that evaluated and elucidated the process of developing exceptional talents. In the article 'The Role of Gifts and Markers in the Development of Talent' (1982), 70 individuals known as among the best in their field—mathematicians, Olympic swimmers, and concert pianists—were interviewed, along with their parents, teachers, and other significant persons. The three main characteristics frequently shared were willingness to work, competitiveness, and ability to learn new techniques. The study noted that parents' belief in their children as talented led to an environment allowing growth through hiring teachers/tutors, opportunities in competitions and events, and overall encouragement.
Reader's Guide
Benjamin Bloom's work fundamentally shaped educational theory and practice. His taxonomy of educational objectives provided a structured framework for educators to describe, assess, and classify learning outcomes, becoming a foundation of the academic profession according to the 1981 survey by Harold G. Shane and the National Society for the Study of Education. The taxonomy remains widely used in curriculum design and assessment. Bloom's Mastery Learning procedure introduced a systematic approach to individualized instruction, hypothesizing that adapting teaching methods to student needs could improve learning opportunities for all children. The procedure required teachers to organize skills into instructional units of 1–2 weeks, with assessments providing constructive feedback, corrective assignments for students who lacked understanding of major concepts, and enrichment activities for those who showed mastery. His research on talent development, including the 1982 study of 70 eminent individuals—mathematicians, Olympic swimmers, and concert pianists—highlighted the role of environmental factors such as parental encouragement and markers like perceived giftedness in fostering exceptional achievement. Bloom's contributions, including the 2 Sigma Problem, continue to influence educational research and practice, emphasizing the potential for all students to achieve high levels of learning under appropriate conditions.
Did You Know?
- Bloom received both his bachelor's and master's degrees from Pennsylvania State University in 1935.
- He served as president of the American Educational Research Association from 1965 to 1966.
- Bloom's taxonomy was one of the first attempts to systematically classify levels of cognitive functioning.
- In the 1982 study 'The Role of Gifts and Markers in the Development of Talent,' 70 individuals including mathematicians, Olympic swimmers, and concert pianists were interviewed.
- Bloom's Mastery Learning procedure requires teachers to organize skills into instructional units of approximately 1–2 weeks in length.
Frequently Asked Questions
Who is Benjamin Bloom?
Benjamin Samuel Bloom (1913–1999) was an American educational psychologist and didactician who reshaped how educators think about learning outcomes. He is best remembered for creating a hierarchical framework for classifying educational objectives and for advancing the concept of mastery learning.
What is Bloom's taxonomy?
Bloom's taxonomy is a hierarchical system Bloom developed for categorizing educational objectives into levels of cognitive complexity, ranging from basic recall up through analysis, synthesis, and evaluation. It became a foundational tool for curriculum design, assessment, and instructional planning used by educators worldwide.
What is the 2 Sigma Problem?
The 2 Sigma Problem is a challenge Bloom identified in which one-on-one tutoring consistently outperforms traditional classroom instruction by roughly two standard deviations. He argued that the central difficulty in education is figuring out how to deliver that level of individualized attention at scale.
What is mastery learning?
Mastery learning is a pedagogical approach Bloom championed, in which students must demonstrate full competence on a topic before advancing to the next one. Rather than moving forward on a fixed schedule or grading on a curve, learners receive additional time and support until they truly master the material.
Why is Benjamin Bloom important to psychology and education?
Bloom's work fundamentally changed how teachers design curricula, write assessments, and think about what students are expected to learn. His taxonomy and mastery-learning ideas continue to underpin educational standards, classroom practice, and instructional research well into the twenty-first century.
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