How do you test writing proficiency?

To test writing proficiency, one can evaluate a variety of written samples, such as essays, reports, or creative pieces, focusing on clarity, coherence, grammar, and vocabulary usage. Standardized assessments like the TOEFL or IELTS also provide structured evaluations. Additionally, peer reviews and feedback can offer insights into a writer's ability to communicate effectively and adhere to conventions. Finally, timed writing exercises can gauge how well individuals express their thoughts under pressure.