"Tier I" typically refers to the highest level in a classification system, often used in education, finance, or business. In education, it represents the primary level of support provided to all students, focusing on high-quality instruction and universal strategies to meet diverse learning needs. In finance, "Tier I" capital is a measure of a bank's financial strength, consisting mainly of common equity and retained earnings. It is crucial for assessing a bank's ability to withstand financial stress and maintain solvency, ensuring stability in the banking sector.