AVE	Average Variance Extracted
CFA	Confirmatory Factor Analysis
CR	Composite Reliability
CRF	Case Report Form(s)
CRN	Clinical Research Nurse(s)
CRO	Clinical Research Organization(s)
CVI	Content Validity Index
CVR	Content Validity Ratio
ECV	Explained Common Variance
EFA	Exploratory Factor Analysis
GCP	Good Clinical Practice
ICH-GCP	International Council for Harmonisation—Good Clinical Practice
IRCCS	Istituto di Ricovero e Cura a Carattere Scientifico (Italian research hospital)
KMO	Kaiser–Meyer–Olkin (measure of sampling adequacy)
M	Mean
ML	Maximum Likelihood
MSA	Measure(s) of Sampling Adequacy
PA	Parallel Analysis
SD	Standard Deviation
Se-CRN	Clinical Research Nursing Competencies–Self-Efficacy (scale)
S/N	Signal-to-Noise Ratio
α	Cronbach’s alpha
c	Complexity
h2	Communality
u2	Uniqueness
ωh	Omega hierarchical
ωt	McDonald’s omega total