What is SEI,CMM,CMMI and ISO

SEI:

Software Engineering Institute. It is Active development of the model by the US Department of Defence Software Engineering Institute (SEI) began in 1986.

CMM:

Capability Maturity Model. The term maturity relate to the degree of formality and optimization of processes. There are five levels defined in CMM.

Level 1: Initial  - It is the starting point for use of a new or undocumented repeat process.

Level 2: Repeatable - the process is at least documented sufficiently such that repeating the same steps may be attempted.

Level 3: Defined - the process is defined/confirmed as a standard business process, and decomposed to levels 1, 2 and 3.

Level 4: Managed - the process is quantitatively managed in accordance with agreed-upon metrics.

Level 5: Optimizing - process management includes deliberate process optimization/improvement.

CMMI:

Capability Maturity Model Integration . It is a process improvement approach that helps organizations improve their performance. CMMI can be used to guide process improvement across a project, a division, or an entire organization. It’s integrate traditionally separate organizational functions, set process improvement goals and priorities, provide guidance for quality processes, and provide a point of reference for appraising current processes.

ISO:

International Organization for Standards ISO 9000 is a series of standards, developed and published by the International Organization for Standardization, The ISO 9000 standard is the most widely known and It serves many different industries and organizations as a guide to quality products, service, and management.  In order to be certified, the organization must submit to an examination by an outside assessor.