Repetitive Tasks

Repetitive tasks   - tasks that are  performed several times during a shift, 
or a number of times during a short time period, e.g. in the course of a week. 
Repetitive tasks can be tedious and reduce arousal (i.e. be boring). 
Most of the human factors research associated with repetitive tasks has been carried out in manufacturing environments where workers carry out the same action many times a minute. This does not generally apply to maintenance engineering.
Main danger with repetitive tasks is that engineers may become so practiced at such tasks that they may cease to consult the maintenance manual, or to use job cards. Thus, if something about a task is changed, the engineer may not be aware of the change. 
Complacency - an engineer may skip steps or fail to give due attention to steps in a procedure, especially if it is to check something which is rarely found to be wrong, damaged or out of tolerance. This applies particularly to visual inspection, which is covered in greater detail in the next section.
Making assumptions along the lines of ‘Oh I’ve done that job dozens of times!’ can occur even if a task has not been undertaken for some time. It is always advisable to
be wary of changes to procedures or parts, remembering that ‘familiarity breeds contempt’.

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