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Mastery-based learning

Also called competency-based education, mastery learning, self-paced learning, proficiency-based learning, micro-schools.

Ages Ages 5 to 18Grades K–12Planning A plan you adaptScreens Screens fit wellShelf Whole-school philosophiesUpdated November 2026

Mastery-based learning, called competency-based education in schools, lets each student move on when they show they have learned a skill, rather than after a set number of weeks. Students who need more time get extra teaching and practice; students who show mastery early move ahead. It runs from a single math program at home to whole school systems, and it underpins self-paced software such as Khan Academy and micro-schools such as Acton Academy and Alpha School. It suits children who need a different pace in different subjects.

1 Where it came from

Mastery learning is most associated with the educational psychologist Benjamin Bloom. Its basic cycle is simple: teach a unit, check it with a short test, give extra help to students who haven't mastered it, then check again before moving on. In 1984 Bloom reported that group mastery learning raised achievement by about one standard deviation, and one-to-one tutoring by about two. In schools the idea now goes by competency-based education; the Aurora Institute published an updated seven-part definition of it in 2019.

2 The big ideas

  • Time varies, learning doesn't. Every student is expected to master the skill; what changes is how long it takes.
  • Progress on evidence, not seat time. Students advance when they show mastery, not when a unit's weeks are up.
  • Check often, and use the checks. Short, meaningful assessments give timely evidence of what each student knows.
  • Help comes quickly. Students who haven't mastered a skill get timely, differentiated support before moving on.
  • Different paths and paces. Students can learn actively through different routes, at varied speeds.

3 What a lesson looks like

A 5th-grade class is learning to add fractions with unlike denominators. On Monday the teacher teaches the skill with fraction strips and worked examples, then students practice. Wednesday is a short check. Students who score well (say, 8 of 10) move to an extension: word problems and fractions on a number line. Students who don't get a second teaching in a small group with the teacher, using drawings and fresh examples, then try a new version of the check on Friday. In a self-paced classroom or at home, the same idea plays out on a screen or in a workbook: the child works through a lesson, takes a short quiz, and the next lesson unlocks only when they pass, with earlier skills coming back for review. In a micro-school, a student might spend the morning on adaptive software at their own level and the afternoon on group projects with a "guide".

4 Reading and math

Math suits mastery best, because skills build in a clear order and are easy to check. Early reading also builds in steps (sounds, then blending, then patterns), and many phonics programs teach a pattern until it is secure. Writing, literature and history are harder to break into small checkable skills, so mastery systems lean on rubrics and portfolios there.

5 The adult's job

The adult teaches, writes or picks short checks, reads the results, and gives extra teaching to students who need it while keeping others moving. In self-paced settings the adult becomes a coach or "guide", watching dashboards, unsticking students and making sure children are actually learning rather than clicking through.

6 How progress is checked

Frequent short checks tied to specific skills, with retakes after more teaching. Schools often report progress skill by skill instead of with one letter grade. Self-paced platforms track mastery automatically. Some micro-schools also cite standardized test results.

7 Strengths and criticisms

Strengths

  • Some of the strongest evidence in education: mastery programs raised achievement by about half a standard deviation on average across 108 studies.
  • Children who are ahead aren't held back, and children who are behind aren't pushed on with gaps.
  • Each subject can move at its own pace for each child.
  • Fits homeschool well, where one child and one adult make pacing easy.

Criticisms and watch-outs

  • Mastery today isn't memory next month. Without spaced, mixed review later, mastered skills fade; good programs bring them back.
  • Self-paced can mean alone. Hours on software with little teaching or discussion can drift into clicking through.
  • Bold claims need checking. Alpha School says its classes rank in the top 1% nationwide and that students learn twice as much, without a published method; reporting and commentary have questioned the evidence and say the academic block can run longer than two hours. Tuition at its Austin campus is reported near $40,000 a year.
  • Bloom's 2-sigma figure comes from small studies. The broad average (about half a standard deviation) is the safer expectation.
  • Harder to run in a class. Students spread across many skills at once take careful planning.

8 What the research says

Mastery learning is one of the better-studied ideas in this guide. A review by Kulik, Kulik and Bangert-Drowns (1990) found mastery programs raised achievement by about half a standard deviation on average across 108 studies. Bloom (1984) reported about one standard deviation for group mastery learning and about two for one-to-one tutoring, but his were small studies, while Kulik's is a broad average. Evidence for specific competency-based school systems and for micro-schools is much thinner: Acton Academy and Alpha School publish their own figures, and we found no independent evaluations of either. Mastery works best with the practices in What works in every approach, especially spaced and mixed review after a skill is learned.

9 How to try it

  1. Pick one subject. Math is the easiest place to start.
  2. Set a simple bar. For example, 8 of 10 right on a short check, on two different days, before moving on.
  3. Check after each small skill. Five to ten problems, not a long test.
  4. Reteach differently when it isn't there yet. Use objects, drawings or a new example, not the same explanation louder.
  5. Bring old skills back. Mix a few earlier problems into every practice session so mastered skills stay.
  6. Let the child see their progress. A skill chart they color in shows that time spent pays off.

10 Using Peabody with it

  • Math DojoMath-fact practice on a mastery ladder, where known facts come back after days instead of being drilled every time.
  • Learning gamesPeabody's practice climbs a mastery ladder per subject, with the grade setting only the first rung, and brings known things back after 1, 3, 7 and 21 days.
  • Math fact fluencyTeacher tools for checking and building fact mastery.
  • Spaced practiceHow to schedule review so mastered skills last.
  • Mastery-based curricula comparedPrograms the homeschool comparison labels mastery, with price and format.

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11 Programs that follow it

Programs and materials often named with this approach: Khan Academy, Acton Academy, Alpha School.

From our homeschool curriculum comparison, programs whose publishers describe them this way:

All 17 compared, with prices

Questions people ask

What is the difference between mastery-based and competency-based learning?
They are close to the same idea. Mastery learning is Bloom's term for teaching a unit until students show they have learned it; competency-based education is the name schools and policy groups use for whole systems where students progress on evidence of mastery rather than seat time.
Is Khan Academy mastery-based?
Khan Academy is a nonprofit offering more than 840 free courses for K-12 and early college, which many families and schools use for self-paced practice; it reports 100 million learners in the 2025-26 school year and offers an AI tutor called Khanmigo. Whether a child truly works to mastery depends on how the adult sets it up, such as requiring a skill to be passed before moving on.
What is a micro-school?
A very small private school, often with mixed ages. Acton Academy, founded in Austin by Jeff and Laura Sandefer, uses Socratic discussion, self-paced goals and project "quests" with adults as "guides", and says it has over 300 micro-schools in more than 30 countries. Alpha School describes a model of about two hours of morning academics on adaptive software and an AI tutor, with afternoons for life skills.
Does mastery learning work?
On average, yes: a review of 108 studies found gains of about half a standard deviation. The best results come when mastery is followed by spaced review so skills last.

Sources

  • Mastery math: Teach one topic in small connected steps until it is secure, keep the whole class together, and only then move on.
  • Spiral math: New topics in small pieces, and every day's practice mixes in problems from earlier lessons so nothing is learned once and dropped.
  • What works in every approach: The handful of study and teaching habits with strong research behind them, which fit inside Montessori, classical, school or anything else.
  • Eclectic homeschooling: Mixing approaches subject by subject: structured math and phonics, say, with literature-rich history and a theme or project on top.
  • Math fact fluency: Knowing addition and multiplication facts by heart, built from strategies first and then short practice, as one strand of math, not all of it.
  • Every approach in the curriculum guide

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