Psychological research uses scientific methods to provide enlightening and reliable information about behavior. Science is derived from the Latin word “scire” i.e. to know. Science avoids mere opinions, intuitions and guesses and strives to know by using objective evidence. Science uses logic to reason about the possible causes of a phenomenon and then tests the resulting ideas psychology relies on empirical evidence i.e. information gained from direct observation.The information is collected systematically through carefully designed experiments; various assumptions can be validated or refuted