The Full Form of LCSAJ is Linear Code Sequence and Jump.

Linear code sequence and jump (LCSAJ), in the broad sense, is a software analysis method used to identify structural units in code under test. Its primary use is with dynamic software analysis to help answer the question “How much testing is enough?”.^[1] Dynamic software analysis is used to measure the quality and efficacy of software test data, where the quantification is performed in terms of structural units of the code under test. When used to quantify the structural units exercised by a given set of test data, dynamic analysis is also referred to as structural coverage analysis.

In a narrower sense, an LCSAJ is a well-defined linear region of a program’s code. When used in this sense, LCSAJ is also called JJ-path, standing for jump-to-jump path.