Each program is created with a specific purpose and has unique operations and activities, (i.e., no program is made for the same purpose and to operate the same way as a previously existing program) and it is assigned an official name to differentiate it from other programs. A program may be called by a different term than its official name by the general public, by an entity, or even by law or regulation—such as by the type of activity or service it engages, by a specific project name (e.g., the Big Dig tunnel project), or any other similar term. This type of name, title or term given to a program is called the "popular name". However, the official name of program is standardized within the federal government so that federal agencies can maintain better accountability of their assigned assistance.