This study examined sources of stress among baseball and softball umpi
res. A revised sources of stress scale from the Ontario Soccer Officia
ls Survey (OSOS) was completed by 782 certified umpires from randomly
chosen umpire associations in one state. Principal components factor a
nalysis of responses by half the subjects, with oblimin rotation, reve
aled four correlated factors (Fear of Failure, Fear of Physical Harm,
Time Pressure, and Interpersonal Conflict). These factors accounted fo
r 44.4% of the variance. Confirmatory factor analysis of responses by
the remaining subjects with LISREL7 supported the reliability of the e
xploratory analysis, with an Adjusted Goodness-of-Fit Index of .90. Ac
cumulating research suggests there are common, though not very potent,
sources of stress among sport officials, but future research should e
xamine sources of stress in officials of other sports. Stress manageme
nt and situational interventions could benefit the minority of officia
ls who perceive these sources of stress as significant.