What is the difference between direct personal investigation and indirect oral investigation ?

Basis of difference must be :

(i) Collection of Data

(ii) Field of Investigation

(iii) In terms of Information

Basis of differenceDirect personal investigationIndirect oral investigation
Collection of dataThe data collected is original in manner.Method of collecting data can lead to false conclusions.
field of investigationField of investigation is limited.Field of investigation can be large.
InformationInformation is highly reliable.Information can be wrong or biased

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