AO : Announcement of Opportunity

AOR : Astronomical Observation Request

AOT : Astronomical Observation Template

DA : (NASA) Data Analysis

DDT : Director's Discretionary Time

D/SRE : (ESA) Director of Science and Robotic Exploration

ESA : European Space Agency

ESO : European Southern Observatory

FAQs : Frequently Asked Questions

GT : Guaranteed Time

HCNE : Herschel Confusion Noise Estimator

HCSS : Herschel Common Science System

HDC : Herschel Duplication Checker

HIFI : Heterodyne Instrument for the Far Infrared

HIPE : Herschel Interactive (data) Processing Environment

HOSS : Herschel Optical System Scientist

HOTAC : Herschel Observing Time Allocation Committee

HROST : Herschel Reserved Observations Search Tool

HSA : Herschel Science Archive

HSC : Herschel Science Centre

HSpot : Herschel observation planning tool

ISO : Infrared Space Observatory

KP : Key Programme

LP : 'Large' Programme (in OT1)

MS : Mission Scientist

NASA : National Aeronautics and Space Administration

NHSC : NASA Herschel Science Center

NP : 'Normal' Programme (in OT1)

OT : Open Time

PACS : Photodetector Array Camera & Spectrometer

PDF : Portable Document Format

PI : Principal Investigator

ROL : Reserved Observations List

RSP : Routine Science Phase

SDP : Science Demonstration Phase

SMP : Science Management Plan

SPIRE : Spectral and Photometric Imaging Receiver