what is meant by direct personal investigation?give its merit and demerits
direct personal investigation is the method in which data are collected by the investigator personally from sources concerned.
1.this method ensures high degree of accuracy.
2.collected data are uniform because they are collected bu one person.
3.original data are collected by this method.
4.comparative study is possible.
1.this method reuires a long time an envolves enormous cost.
2.this method consumes more time.
3. in this method there is more use of power.
4.this method is highly prone to personal bias of the investigator.