Final answer:
Assessments such as grasp checks and performance tasks are used to measure student ability to determine proficiency levels. International assessments like PIAAC also play a role in measuring proficiency levels across countries.
Step-by-step explanation:
A variety of assessments are used to measure student ability to determine proficiency levels. One example is formative assessments, such as grasp checks, which review comprehension of concepts and skills through interactive features and practice problems. Another example is performance tasks, which challenge students to apply what they have learned to practical situations.
Additionally, international assessments like the Programme for International Assessment of Adult Competencies (PIAAC) measure the skill levels of adults in literacy, numeracy, and problem-solving. These assessments help determine proficiency levels across countries.