What is meant by direct personal investigation? Give its merit and demerits.

In direct personal invertigation, the investigator obtains the first-hand information from the respondents themselves. He personally visits the respondents to collect the data.

Merits:

• Reliable and accurate data collected
• Flexibility for questions
• Additional informations can also be collected

Demerits:

• It is a time consuming process
• Cannot be done for wide area location
• It cost more