What is Due Diligence?

What due diligence is, is an acceptable amount of work. The phrase due diligence is most commonly used in legal settings to indicate that adequate work was done toward reaching some end. For example, ‘The executor of the estate used due diligence to reach any potential heirs.’ This might be said in a context where a person died without a will and without known relatives. The executor of the estate most likely would use due diligence by placing notices in newspapers and legal journals asking for any relatives of the deceased to come forward.