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In the second language (L2) assessment realm, cognitive diagnostic assessment (CDA) emerges as an exceptionally practicable methodology, enabling a meticulous analysis of linguistic competencies and furnishing granular insights into learners’ proficiencies and deficiencies, thereby charting precise remedial pathways. The primary objective of this research was to develop a cognitive model of attributes underlying an International English Language Testing System (IELTS) assessment descriptor, namely grammatical range and accuracy. The model sought to enable the development of a diagnostic instrument informed by CDA, which would investigate candidates’ grammatical strengths and weaknesses to improve their performance in the IELTS. Through a multi-stage process involving qualitative data collection, interpretation, and synthesis, a comprehensive scheme emerged, categorizing cognitive attributes into two main areas: (a) knowledge of grammatical forms, including pronouns, determiners/quantifiers, adjectives, adverbials, nouns/noun phrases, verbs/tenses, and prepositions, and (b) familiarity with structural nuances, including punctuation and structural sophistication. These nine micro-level attributes comprised several sub-components aligned with three proficiency classes: A1-A2, B1-B2, and C1-C2. The model laid the groundwork for developing a three-booklet multiple-choice test. Alongside conducting pilot testing and item analysis, the study employed a saturated psychometric model to validate the CDA-informed instrument. The results confirmed the instruments’ internal consistency, validity, satisfactory fit, and effectiveness in classifying examinees based on attribute-specific mastery levels. The findings underscored severe weaknesses in punctuation, structural complexity, and verb tense usage, pinpointing crucial areas demanding targeted instructional enhancement. The theoretical implications highlight a refined understanding of grammatical competencies, while pedagogically, the results advocate for targeted teaching strategies.

The study examines the effects of the Self-Determined Learning Model of Instruction (SDLMI) on intermediate English as a foreign language (EFL) learners’ L2 autonomous motivation, self-efficacy, and perceived locus of causality. Given the evolving paradigms of language teaching, SDLMI values ​​autonomy, competence and connectedness in teaching instruction and offers a distinctive approach. Drawing on contemporary motivational theories, the study examines how SDLMI impacts these key dimensions in intermediate EFL learners compared to a traditional instructional approach. Participants from four EFL classrooms completed SDLMI in the experimental group and conventional instruction in the control group. Instruments included the Preliminary English Test, motivational questionnaires, and SDLMI-based assessments. Data were analyzed using descriptive statistics and independent samples t-tests. Descriptive statistics for both groups (mean and SD) were calculated. Independent samples t-tests were conducted to compare the means between the experimental group and the control group and to examine possible significant differences in the effect of SDLMI on autonomous motivation, self-efficacy, and perceived locus of causality. The study contributes to instructional practices, advocating for autonomy-supportive strategies in fostering holistic language.