• Results from repeated and cumulative stress... some refer to it as "Burnout".
Chronic fatigue is a short term condition that can be relieved by adequate rest and sleep; usually we can recover full alertness in just a few days with longer sleep (sleeping longer on weekends, etc.).
Factors that May Results in Operator Fatigue
• Quality and quantity of rest or sleep.
• Individual physical fitness.
• Individual endurance to demanding tasks.
• Environmental conditions of heat, humidity, cold, altitude, etc.
• Types of tasks, Time-of-day, Personal motivation and Individual differences.
How to Counteract Fatigue
• Rest may be a break in activity, or simply a change of pace or even a change in activities.
• Rest breaks permit us to restore our energy, break the monotony, or give our bodies and minds relief.
Rest is not the same as sleep and it will not substitute for needed sleep.
• Plan ahead to get enough sleep; develop a schedule of daily activities.
• Drink plenty of WATER, the benefits of water greatly outweight caffeinated beverages that effect you hour later and prevent you from sleeping well.
• When driving keep your vehicle cool, open a window, turn on the air conditioner. Heat intensifies fatigue.
• If you are too fatigued to drive, DON'T.
- Car pool with another co-worker
- call to have someone pick you up
- or call a taxi.
Keep your mind focused when driving. Do not smoke, talk on a cell phone, eat, or do any other activity that takes your mind away from the road. These activities, along with fatigue, can be detrimental to your safety and that of all other motorist on the road.
An important distinction must be made between a Likert scale and a Likert item. The Likert scale is the sum of responses on several Likert items. Because Likert items are often accompanied by a visual analog scale (e.g., a horizontal line, on which a subject indicates his or her response by circling or checking tick-marks), the items are sometimes called scales themselves. This is the source of much confusion; it is better, therefore, to reserve the term Likert scale to apply to the summated scale and Likert item to refer to an individual item.
A Likert item is simply a statement which the respondent is asked to evaluate according to any kind of subjective or objective criteria; generally the level of agreement or disagreement is measured. Often five ordered response levels are used, although many psychometricians advocate using seven or nine levels; a recent empirical study found that a 5- or 7-point scale may produce slightly higher mean scores relative to the highest possible attainable score, compared to those produced from a 10-point scale and this difference was statistically significant. In terms of the other data characteristics, there was very little difference among the scale formats in terms of variation about the mean, scenes or kurtosis. The format of a typical five-level Likert item is:
1. Strongly disagree
3. Neither agree nor disagree
5. Strongly agree.
Likert scaling is a bipolar scaling method, measuring either positive or negative response to a statement. Sometimes a four-point scale is used; this is a forced choice method since the middle option of "Neither agree nor disagree" is not available.
Likert scales may be subject to distortion from several causes. Respondents may avoid using extreme response categories (central tendency bias); agree with statements as presented (acquiescence bias); or try to portray themselves or their organization in a more favorable light (social desirability bias). Designing a scale with balanced keying (an equal number of positive and negative statements) can obviate the problem of acquiescence bias, since acquiescence on positively keyed items will balance acquiescence on negatively keyed items, but central tendency and social desirability are somewhat more problematic.