The decision by one person (Individual decision making) is used for a simple decision that people make the decision to have predefined or urgent emergency that does not have enough time for consultation with another person.
The decision by one person (Individual decision making) for a decision on the matter is that the decision was predetermined. Emergency or urgent, no time for consultation with other parties.
The decision made by one person (Individual decision making) is used for decision making in easy to decide that was set in advance. There is an emergency or urgent enough time for a consultation with other people.