Deductive and inductive reasoning
There are two types of reasoning: deductive reasoning and inductive reasoning. Both types of reasoning are routinely employed.
Deductive reasoning is the type of reasoning that proceeds from general principles or premises to derive particular information. Deductive reasoning is dependent on its premises, a false premise can possibly lead to a false result; applies general principles to reach specific conclusions. In deductive reasoning, the evidence provided must be a set about which everything is known before the conclusion can be drawn. Since it is difficult to know everything before drawing a conclusion, deductive reasoning has little use in the real world.
Inductive reasoning examines specific information, perhaps many pieces of specific information, to derive a general principle. Inductive reasoning/inductive logic is the complement of deductive reasoning; the process of reasoning in which the premises of an argument are believed to support the conclusion but do not ensure it. It is used to formulate laws based on limited observations of recurring phenomenal patterns.