There’s also some solid research behind it. A few studies (like Kiany & Shiramiry, 2002) found that dictation improves listening comprehension, grammar accuracy, and even writing fluency. Other studies link it to better vocabulary retention and processing speed. Not bad for something this simple.

Kiany, G. R., & Shiramiry, E. (2002). The Effect of Frequent Dictation on the Listening Comprehension Ability of Elementary EFL Learners. TESL-EJ.

Rahimi, M. (2008). Using Dictation to Improve Language Proficiency. Asian EFL Journal.

Nation, I. S. P. (2009). Teaching ESL/EFL Listening and Speaking. Routledge — recommends dictation for processing and noticing gaps in spoken language.