Differential mastery criteria impact sight word acquisition and maintenance: Application to individual operants and teaching trial doses

Kim and team asked a simple question: how many teaching trials does a kid really need before we call a sight word mastered? They worked with four elementary students who had learning or language delays.

Each child rotated through three mastery rules. One rule waited until the whole set of five words hit 100 % correct (Set Analysis 5). Another rule mastered each single word after five straight correct responses (Operant Analysis 5). The final rule used only three straight correct responses per word (Operant Analysis 3). Every session held either 12 or 20 trials.

The Operant Analysis 3 rule with 12-trial sessions won. Kids learned words twice as fast and still had them two weeks later. The old-style set rule needed more sessions and still produced mixed maintenance scores.

Smaller bites of teaching, checked word-by-word, beat the big-block approach every time.

Vladescu et al. (2021) saw the same speed boost when they cut tact sets from 12 items down to 3-6. Kim’s study moves that idea into sight-word drills and swaps set size for mastery rule, showing the magic number is still small.

Fienup et al. (2017) already hinted that 12-trial blocks help college kids form equivalence classes. Kim proves the dose works for younger kids learning real reading skills.

Carey et al. (2014) warned that sparse data sampling can fool your visual analysis. Kim’s fine-grained, every-trial graph backs up that warning; the 12-trial mini-sessions give clear, undistorted mastery lines you can trust.

If you run discrete trials for reading, drop the 20-trial marathon. Switch to 12-trial sprints and master each word after three correct in a row. You will teach more words per week and the student keeps them. No extra prep, no new materials—just faster, stronger learning.