Information Management System 
Integrated Master Schedule 
International Monitoring System 
Integrated Management System 
International Military Staff 
Inventory Management System 
I am sorry 
Ion Mobility Spectrometry 
Incident Management System 
Inductive Magnetic Saturation 
Instant Mobility System 
Intermodal Management System 
International Magnetospheric Study 
International Military Students 
Ion Mass Spectrometer 
I'm Sorry 
Industrial Management Society 
Industrial Mathematics Society 
Institute of Management Services 
Institutional Management Support 
Institutional Management System 
Instructional Management System 
Instructional Management Systems 
Intelligent Manufacturing Systems 
IP Multimedia Subsystem 
Ice Mapping System 
Identity Management System 
Image Management System 
Industrial Methylated Spirit 
Information Management Staff