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5 Information Systems Software Software may also be written in a low-level assembly language, which has a strong correspondence to the computer's machine language instructions and is translated into machine language using an assembler. Freedom 1 includes the freedom to use your changed version in place of the original. These binaries are not free software even if the source code they are compiled from is free. An important distinction is custom software development as opposed to commercial software development. Custom software development is the process of designing, creating, deploying and maintaining software for a specific set of users, functions or organizations. In contrast, commercial off-the-shelf software is designed for a broad set of requirements, allowing it to be packaged and commercially marketed and distributed. However, software testing rarely—if ever—eliminates every bug; some programmers say that "every program has at least one more bug" (Lubarsky'