This document outlines various topics related to language testing, including types of tests, approaches to testing, validity and reliability, and achieving beneficial backwash effects. It discusses proficiency tests, achievement tests, and diagnostic tests. It also covers direct and indirect testing, norm-referenced and criterion-referenced testing, and objective and subjective testing. Validity is defined as accurately measuring the intended abilities, while reliability is consistency of results. Achieving beneficial backwash means testing abilities you want to foster and ensuring students and teachers understand the test.