What is the difference between indirect oral investigation method and information from local sources method?

Dear student,

In the indirect oral investigation, the data is collected indirectly bt the interviewing persons who are known to the investigator.
In information through Local Correspondents, the investigator does not work directly but appoints local correspondents in different areas

indirect oral investigation	Information through Local Correspondents
This method can be used where the area of inquiry is not so wide	This method can be used where the area of inquiry is wide
The information obtained from the other persons may not be reliable	Data are not reliable which are collected by this method
Simple and economical	The data are not original
Third-party does not conceal the facts	Third-party may conceal the facts

Regards.