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This coda article offers unified theoretical accounts of the major findings of the empirical studies in this special issue of Optimizing Second Language Practice in the Classroom: Perspectives from Cognitive Psychology. We present a theoretical framework from cognitive psychology (desirable difficulty framework) and link it to the ideas of second language (L2) difficulty. We argue that practice condition, linguistic difficulty, and individual differences need to be taken into account for creating optimal, deliberate, and systematic L2 practice. The desirable difficulty framework may serve as a theoretical foundation to better understand the role of practice on L2 acquisition, as well as to gain insights into effective L2 teaching. Future directions for research are presented to further develop this emerging field of L2 practice.

In the coda chapter of the special issue on second language (L2) practice and cognitive psychology, we proposed a theoretical framework for optimizing and researching L2 practice (Suzuki, Nakata, & DeKeyser, 2019). Rogers and Leow's commentary (2020) raised three potential issues regarding this framework, and the present response article aims at addressing them. First, we introduce two recent studies to illustrate the importance of expounding on learning processes during L2 practice. Second, we argue that our framework can guide researchers to systematically investigate multiple key factors toward a more comprehensive picture of L2 learning. Last, we expect that L2 practice research can potentially lead to broader pedagogical implications beyond classroom teaching (material development and technology‐mediated learning).

This study investigated the effects of reading bilingual books on vocabulary learning. Eighty-two Chinese English as a foreign language (EFL) learners read different versions of the same text: English-only text, English text with target words glossed, English text followed by the Chinese text, and Chinese text followed by the English text. A pretest, immediate posttest, and delayed posttest were used to measure incidental vocabulary learning. The findings showed that (a) all four groups made significant gains in lexical knowledge, (b) those who read glossed text and bilingual text had significantly durable knowledge gain, (c) the participants who read glossed text or read the English version of the text before the Chinese version had significantly higher scores text in the immediate posttest than the participants who read the English-only text, and (d) the participants who read bilingual texts had significantly higher scores on the delayed posttest than those who read the English-only text.