4M	Man, Machine, Methods, Materials
AADL	Architecture Analysis and Design Language
AI	Artificial Intelligence
ANN	Artificial neural network
AR	Augmented Reality
ARIMA	Autoregressive integrated moving average
ARMA	Autoregressive–moving average
ARMAX	AutoRegressive Moving Average with eXogenous input
AWS	Amazon Web Services
CAD	Computer-Aided Design
CBR	case-based reasoning
CMMS	computerized maintenance management system
CNN	Convolutional Neural Network
CoAP	Constrained Application Protocol
CUSUM	Cumulative Sum
CWT	continuous wavelet transform
DC	direct current
DCS	distributed control system
DP	Dynamic programming
DWT	discrete wavelet transform
EAM	enterprise asset management
EMD	empirical mode decomposition
ERP	Enterprise Resource Planning
FDI	fault detection and identification
FMEA	Failure Mode and Effect Analysis
FTA	Fault tree analysis
GA	Genetic algorithm
HHT	Hilbert–Huang transform
HMM	hidden Markov model
IaaS	Infrastructure as a Service
ICT	Information and communications technologies
IIoT	Industrial Internet of Things
IMF	intrinsic mode function
KPI	Key Performance Indicator
LSTM	long short-term memory
MCSA	Motor Current Signature Analysis
MES	Manufacturing Execution System
ML	Machine learning
MLP	multi-layer perception
MQTT	Message Queuing Telemetry Transport
MTBF	mean time between failure
MTTF	mean time to failure
NLP	Natural Language Processing
OPC UA	OPC Unified Architecture
OT	Operational Technology
PaaS	Platform as a Service
PCA	principal component analysis
PdM	Predictive maintenance
PHM	Proportional hazard model
PLC	programmable logical controller
PLS	partial least squares
PSO	Particle swarm optimization
PV	photovoltaic
QTA	Qualitative trend analysis
RBF	radial basis function
RCA	Root cause analysis
RCM	Reliability-Centered Maintenance
RF	Radio frequency
RFID	Radio-frequency identification
RNN	recurrent neural network
RPN	risk priority number
RUL	remaining useful life
SaaS	Software as a Service
SCADA	Supervisory Control And Data Acquisition
STFT	Short-time Fourier Transform
SVM	support vector machine
SVR	Support Vector Regression
TPM	Total Productive Maintenance
UML	Unified Modeling Language
WT	Wavelet transform
WVD	Wigner–Ville Distribution
XML	Extensible Markup Language
XMPP	Extensible Messaging and Presence Protocol