Many words in English are morphologically complex (*assign*-*ment*, *teach*-*er*) and so being able to proficiently apply the correct endings (suffixes) to complex words is an important skill to acquire. In this project we analyzed the written production of English language learners and asked *What kinds of morphologically complex words are the most difficult for EFL students to learn?*
This technical report assessed the change in English language skills of 340 EFL students enrolled in a university bridging program. This report used of the Reliable Change Index Statistic in order to test if the change in scores is greater than might would be expected from random variation alone. The report is available on [ResearchGate](https://www.researchgate.net/publication/342691082_Technical_report_on_change_in_language_abilities_of_students_enrolled_in_the_McMaster_English_Language_Development_MELD_program).