Ms. Bays uses frequent assessments to track her students' progress in acquiring math skills. When she assesses her students' skills at, say, algebra, she gives very short assessments (generally a minute or two) and gives them daily. Each assessment looks at a specific algebraic skill that students must understand before moving further ahead in the class. Ms. Bays feels that the type of assessment she uses helps her understand each of her student's strengths and difficulties with regard to component skills. Which of the following best describes how Ms. Bays assesses her class?
a. Informal assessment
b. Performance assessment
c. Curriculum-based measurement
d. Use of a checklist