Computer science · Grades 7–12
Data quality and privacy-aware design · Revision sheet
Collect only what a task needs and distinguish missing values from zero.
Learn the idea
Data
A field should have a clear definition and appropriate type.
Missing
Missing data and a measured zero are different states.
Minimize
Avoid collecting personal details that are unnecessary for the stated purpose.
Access
Private information requires appropriate access controls, not just an unlisted page.
Explain without looking
- A dataset has 50 records and 5 duplicates. How many remain after removing one extra copy of each stated duplicate?
- Why does more collected data not automatically mean a better learning product?
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Independent educational review required. Grade bands are approximate; these are not officially aligned curricula.