Aggregation in the context of a gradebook refers to the method or formula used to calculate a student's overall grade based on the scores of the weighted grade items and categories. It determines how the scores are combined to produce the final grades.

Explanation: There are various aggregation methods, such as weighted means of grades, simple weighted means of grades, means of grades (with extra credit), natural, that can be used to calculate a student's final grades. The choice of aggregation depends on how you want to calculate and represent the overall performance.

A weighted grade category is a way to group and organize different types of assignments or assessments in a gradebook, such as quizzes, exams, and discussion forums, and assignment. 

Each category represents a specific type of work that contribute to a students' overall grade.

Explanation- By assigning weights to different grade categories, you can determine how much each category contributes to the final grade. This means some categories may have a higher impact on the overall grade than others. 

For example, exams might be weighted more heavily than forums.

A weighted grade item is a specific assignment, assessment, quiz, discussion forum or exam within a grade category that contributes a student's grade. Each grade item has a predetermined weight or value that determines its importance in calculating the final grade.

Explanation: Weighted grade items can be various assignments within a category, such as a specific quiz. By assigning weights to these items, you can specify how much each individual task affects the overall grade within its respective category.

Most common method of Aggregation!

Weighted means of grades refers to the calculation of a student's final grades by taking into account the weight assigned to different grade categories and items. It involves multiplying each grade by its respective weight and then summing scores to determine the overall grade.

Explanation: Weighted means of grades allow you to give appropriate importance to each category and item when calculating the final grade. It ensures that categories and items with higher weights have greater impact on the overall grade.