In convenience sampling selection the researcher chooses the sampling units on the basis of convince or accessibility. It is called accidental sampling because the sample units enter by accident. This is also known as a sample of the man in the street i ,e selection of unit where they are sample units are selected because they are accessible. For example in testing a potential new product, the sample work is done by adding the new product to the appropriate shops in the locality. Purchasing and selling of the new product is observed there.