Final answer:
Mr. Tsu's plan for his science class based on assessment results is identified as a unit plan, which provides the teaching framework for a topic.
Step-by-step explanation:
When Mr. Tsu is planning a reading unit for his 7th grade science class based on the assessment results from the last unit, where the majority of students scored above 75, the plan he is creating is best described as a unit plan. A unit plan is a detailed document outlining the curriculum to be covered within a unit of study in a given subject and often includes a theme, standards, goals, assessments, and instructional activities. It is not an individualized assessment plan nor an individualized education plan, because these are typically personalized for a single student's needs rather than for class-wide instruction. Also, it is not solely a data-based decision, as this term refers to the use of data to inform an instructional approach, while Mr. Tsu's plan encompasses the overall strategy for a unit of study.