English is one of the most important second languages in nonnative English-speaking countries, where learning English usually begins in primary school. To this end, vocabulary learning is regarded as the most fundamental and crucial stage in developing the student's English language capability. While some studies have explored strategies of…

Conventional testing systems usually give students a score as their test result, but do not show them how to improve their learning performance. Researchers have indicated that students would benefit more if individual learning guidance could be provided. However, most of the existing learning diagnosis models ignore the fact that one concept…