Pitfalls in Human Research examines 10 ten pivotal points in human research where investigators and experimenters can go astray. Two questions are addressed: At what pivotal points in the complex research process can the experimental study go astray and give rise to misleading results and conclusions? What steps can researchers take to avoid these pitfalls? To answer these questions, those aspects of experimental studies that are under the control of the investigator as well as those aspects that are under the control of the experimenter are examined. This book begins by making a distinction between the investigator and the experimenter, arguing that their roles are functionally quite different. The discussion then turns to the 10 pitfalls in human research, divided into investigator effects and experimenter effects: investigator paradigm effect; investigator experimental design effect; investigator loose procedure effect; investigator data analysis effect; investigator fudging effect; experimenter personal attributes effect; experimenter failure to follow the procedure effect; experimenter misrecording effect; experimenter fudging effect; and experimenter unintentional expectancy effect. This monograph will be a useful resource for both investigators and experimenters, as well as those who utilize research results in their teaching or practice.