Job enlargement means increasing the scope of a job through extending the range of its job duties and responsibilities generally within the same level and periphery. This contradicts the principles of specialisation and the division of labour whereby work is divided into small units, each of which is performed repetitively by an individual worker and the responsibilities are always clear. Some motivational theories suggest that the boredom and alienation caused by the division of labour can actually cause efficiency to fall. Thus, job enlargement seeks to motivate workers through reversing the process of specialisation. A typical approach might be to replace assembly lines with modular work; instead of an employee repeating the same step on each product, they perform several tasks on a single item. In order for employees to be provided with Job Enlargement they will need to be retrained in new fields which can prove to be a lengthy process.
However results have shown that this process can see its effects diminish after a period of time, as even the enlarged job role become the mundane, this in turn can lead to similar levels of demotivation and job dissatisfaction at the expense of increased training levels and costs. The continual enlargement of a job over time is also known as 'job creep,' which can lead to an unmanageable workload.
Hulin and Blood (1968) define Job enlargement as the process of allowing individual workers to determine their own pace (within limits), to serve as their own inspectors by giving them responsibility for quality control, to repair their own mistakes, to be responsible for their own machine set-up and repair, and to attain choice of method. Frederick Herzberg referred to the addition of interrelated tasks as 'horizontal job loading'.