Test pyramid
A model showing that lower test levels (e.g. unit tests) should have many fast, isolated tests, with fewer slower tests at higher levels.
Syllabus chapters: 5
Sources: ISTQB® Certified Tester Foundation Level syllabus 4.0.1 and the official ISTQB® Glossary. Glossary content © International Software Testing Qualifications Board; source: glossary.istqb.org.