According to this method the investigator has to collect his information himself personally from the source concerned. It means the investigator should be are the spot where the enquiry concerned. It means the investigator should be at the spot where the enquiry is being conducted, it is also expected that the investigator should be very polite and courteous. Further he should acquaint himself with the surrounding situation and must know their local customs and tradition.
Advantages:
1. The information collected by this method is reliable and accurate
2. It is a good method for intensive investigation.
3. This method is flexible. Investigator can make requisite changes in the language of the question or otherwise as per the comfort of respondent.
4. Data obtained by this method are more uniform and homogeneous.
5. This method gives a satisfactory result provided the scope of inquiry is narrow.
Disadvantages:
1. This methods is not suitable for extensive inquiry
2. Its required a lot of expenses and time
3. The bias on the part of investigator can damage the whole inquiry
4. Sometimes the informant may be reluctant to answered the question
Suitability:
This method is suitable when scope of enquiry is limited and much accuracy is required.

I will take following steps:
(a) To select three students out of 10we shall assign numbers to different students.
(b) Then we shall refer to random number tables but we shall be concerned with only one digit numbers.
(c) First three one digit numbers will be selected.

Sampling errors are more serious as they may be intentional and biased. Such errors are difficult to be detected and rectified. On the other hand, non sampling errors are clerical errors which can be rectified with greater caution and attention.

Name: _______
Age: ________
Phone No. __________
E-mail ID: ___________
Sex: Male ◻️ Female ◻️
Do you use Vegetable Atta noodles?
Yes◻️ No◻️
If Yes, which brand do you prefer?
Maggie ◻️ Top Ramen ◻️
Tops ◻️ Any of the above ◻️
Why do you like this brand?
Taste ◻️ Price ◻️
Quality ◻️ All of the above ◻️
Have you tried any other brand ever?
Yes◻️ No◻️
Would you like to try if a free sample is
given to you?
Yes◻️ No◻️

1. Do you like to watch movies?
2. If your friend is cheating in examination, will you tell your teacher?
3. Are you married?
4. Are you working?
5. Do you have any vehicle?

(i) (a) Price
(b) Looks
(c) Fabric
(d) Brand
(ii) (a) Daily
(b) Weekly
(c) Biweekly
(d) Monthly
(iii) (a) Hindustan Times
(b) Times of India
(c) Economic Times
(d) Any other
(iv) (a) Completely Agree
(b) Somewhat agree
(c) Completely Disagree
(d) Can't say
(v) (a) Less than 1lakh
(b) 1-51akh
(c) 5-10 lakh
(d) 10 lakh and above