Corrective maintenance is the most basic type, which involves fixing errors or defects discovered after the software is delivered to the users. Adaptive maintenance, on the other hand, adapts the ...

Corrective maintenance involves fixing faults or defects that impact the system's performance, reliability, or security. Adaptive maintenance alters the system to accommodate changes in the ...

so a cost rate model of combinatorial maintenance is an urgent need. However, the optimal combination under various constraints not only involves numerical calculations but also is an NP-hard ...