ProVoc: An app to train vocabulary depth in order to foster children's reading comprehension.

Many studies have demonstrated the crucial role of vocabulary in predicting reading performance in general. More recent work has indicated that one particular facet of vocabulary (its depth) is more closely related to language comprehension, especially inferential comprehension. On this basis, we developed a training application to specifically improve vocabulary depth. The objective of this study was to test the effectiveness of a mobile application designed to improve vocabulary depth. The effectiveness of this training was examined on 3rd and 4th grade children's vocabulary (breadth and depth), decoding and comprehension performances. A randomized waiting‐list control paradigm was used in which an experimental group first received the intervention during the first 4 weeks (between pretest and post‐test1), thereafter, a waiting control group received the training for the next 4 weeks (between postest1 and posttest2). Results showed that the developed application led to significant improvements in terms of vocabulary depth performance, as well as a significant transfer effect to reading comprehension. However, we did not observe such a beneficial effect on either vocabulary breadth or written word identification. These results are discussed in terms of the links between vocabulary depth and comprehension, and the opportunities the app presents for remedying language comprehension deficits in children. Lay Description: What is already known about this topic:Vocabulary is a powerful predictor of both word identification and text comprehensionVocabulary depth rather than breadth is more closely related to language comprehensionDepth of vocabulary is particularly predictive of inferencing skills What this paper adds:We develop a new training application specifically targeting vocabulary depthThe training led to significant gain in children's knowledge for the taught wordsWe also observe a transfer effect with significant improvements in reading comprehension Implications for practice and/or policy:Vocabulary depth trainings represent a good way for remedying language comprehension deficits [ABSTRACT FROM AUTHOR]