• Language policy, planning, and institutional frameworks act as the scaffolding for how languages are taught and used across universities and workplaces, explaining policy-driven differences in language education and multilingual competencies. Key papers show policy orientations, national language policies, and corporate language needs shaping practice and curricula [14], [3], [7], [10], [12], [2].

• Sociocultural and identity dynamics shape learning outcomes, with abroad experiences, acculturation, ethnolinguistic attitudes, and codeswitching influencing motivation, classroom practices, and cross-cultural communication across regions [5], [13], [6], [20], [8].

• Cognitive predictors and modeling of proficiency reveal how aptitude, decoding skills, and prior performance constrain or enable foreign language attainment across contexts—emphasizing measurable predictors of success [9], [11], [3], [1].

• Language use in business and curriculum design frames language as a strategic resource, linking corporate needs, marketing implications, and student perceptions to language policy and education [12], [15], [19].

• Language diversity and sociolinguistic variation surface as policy-relevant concerns about minority languages, codeswitching, and language rights in education and society, highlighting tensions between standardization and multilingual realities [16], [20], [6], [14].