High level vs low level test cases

ISTQB Glossary

test design: The process of transforming general testing objectives into tangible test conditions and
test cases.

test design specification: A document specifying the test conditions (coverage items) for a test item,
specifying the detailed test approach, and identifying the associated high-level test cases.
high-level test case: A test case without concrete (implementation-level) values for input data and
expected results. Logical operators are used; instances of the actual values are not yet defined and/or
available.
low-level test case: A test case with concrete (implementation-level) values for input data and
expected results. Logical operators from high-level test cases are replaced by actual values that
correspond to the objectives of the logical operators.