Mechanical ability is the ability to: operate a computer. ---sway the actions, opinions, or beliefs of others. ---understand the relationship between moving parts. ---form ideas to solve problems or communicate information. ---Truck drivers and retail sales workers are both examples of occupations that are: affected by increases or decreases in the economy. ---not affected by the economy. physically demanding. ---highly stressful. Job areas with the greatest replacement needs are those with: specific training requirements. the smallest groups of occupations. limited training or education requirements. high pay.