The document discusses key qualities of a good test: usability, reliability, and validity. It defines usability as how easy a test is to use, measuring factors like learnability, efficiency, and satisfaction. Reliability refers to how consistently a test measures a characteristic, whether someone would get a similar score by retaking the test. There are different types of reliability. Validity determines how accurately a test measures the intended concept, looking at construct, content, face, and criterion validity.