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within Figure 3 by the probability of non-response, S 3. [6] Once the need
for an action has been recognized, then the human must determine if the
intended action is correct. The ability to detect the presence of inappropriate
stimuli and to subsequently correct its error is denoted within this model as
“coverage.” The probability for coverage is S 4. Once an individual identifies
the need to perform the intended action and if this action is performed in-
correctly, then an error of commission occurs. The likelihood of such an error
is denoted within Figure 3 by the probability of non-compliance, S 6.
The Markov Tree shown has initial state S 1. The human behavior state
model shown in Fig. 3 is constructed on the base of statistical data gathered
from railway employees and students during practice.
Fig. 3. Human Behavior State Model
The probability of dangerous errors of operators on railway trac control
desk is assumed to be
1 · 10 2 -
1 · 10 3 and the probability of correct operation
is between 0,8 and 0,95. [5]
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