these r standards (or) certification of organizations:

SIE/CMMi->Software Eng. Institute/capability Maturity Model
(Carnegie Melon University).it follows 24 kpa...means 24 
rules.it is for any kind of department or company.

PCMM-> People Capability Maturity Model.(only for 
department like HR etc.)

others r:
Six Sigma->Zero defect orientation.e.g motorola

TMM-> Test Maturity model(only for testing team)
CMM->it follows 18 kpa
CMM Level 5-optimizing.
    level 4-managed
    level 3-defined
    level 2-repeatable
    level 1-initial(no rules)

CMMI statnds for Capability Maturity Model Integration is 
an advanced version CMM

CMMP stands for condensed matter and material physics owned 
by private company in aproduction they followes ISO 
standards for production with some other alterd Quality 
standards

CMMi stands for Capability Maturity Model Integration. Here 
Achieving Quality with the help of Integration is required.

CMMp stands for Capability Maturity Model Planning. here 
Configuration Management Master Plan is implemented for 
achieving high quality software.