Let's take, for example, a visiting kind of health care worker, who would be there to assist in helping an older person take medication. They work for an agency in the voluntary sector; sometimes they're trained and sometimes they're not, or have very limited training. They may have one shift one week and two the next week—a very unpredictable kind of workload. Also, there is unpredictable income. That would be one example.
Cleaners would be another example. They may be rotated into different work sites and not have much control over the conditions of the work site, or may face hazardous cleaning materials without proper equipment. Those would be examples of the kinds of low-status jobs where there's not good control over the workplace.