Scrum is an iterative incremental framework - Wiki

http://en.wikipedia.org/wiki/Scrum_%28development%29

Scrum is an iterative incremental framework for managing complex work (such as new product development) commonly used with agile software development. Though not an acronym, some companies implementing the process have been known to adhere to an all capital letter expression of the word, i.e., SCRUM. This may be due to one of Ken Schwaber's early papers capitalizing SCRUM in the title.[1]
Although Scrum was intended for management of software development projects, it can be used to run software maintenance teams, or as a general project/program management approach.