Step 1: Understand the question:
External sources of recruitment are the sources outside the organisation from which it draws candidates.
We explain direct recruitment, casual callers and labour contractors. The last item appears twice in the printed question, but it needs to be explained only once.
Step 2: Direct recruitment:
Under this method a notice giving the job details is put on the notice board of the enterprise.
Job seekers gather outside the premises on the stated date, and selection is done on the spot.
It is used mainly for casual workers in unskilled or semi-skilled jobs, who get daily wages.
Step 3: Casual callers:
Many job seekers send applications on their own, without any vacancy being announced. The firm keeps a database of such unsolicited applicants.
When a vacancy arises, the list is screened and suitable candidates are called.
This reduces the cost of recruiting compared with other external sources.
Step 4: Labour contractors:
Labour contractors may be employees of the organisation. They keep close contact with labourers.
They provide the required number of unskilled workers at short notice.
A drawback is that if the contractor leaves the organisation, the workers he brought in may follow him.
Final Answer:
Direct recruitment uses a notice and on-the-spot selection, casual callers use a database of unsolicited applications, and labour contractors supply unskilled workers at short notice.