Sheriff Ghali Ibrahim, Abdullahi Liman, Iro Iro Uke, The Behavioural Science in Law Making Process: A Psychological Approach to Understanding Legislative Violence, The Social Sciences, Volume 8,Issue 2, 2013, Pages 123-128, ISSN 1818-5800, sscience.2013.123.128, (https://makhillpublications.co/view-article.php?doi=sscience.2013.123.128) Abstract: This study is a behavioral analysis on the causes of violence among people, especially law makers (members of parliament) as they disagree and resort to violence in their legislative chambers. The study also analyses some psychological theories of violence and violent behavior among different houses of parliament. With the aid of both primary and secondary methods of scientific enquiry, findings show that the legislature are prone to violence as a result of narcissistic tendency frustration and by biological or hereditary influence. The study also concludes that violence can be hereditary, it can be based on frustration-aggression dilemma or based on the quest for popularity and failure to get an expected outcome among other things. The study makes the recommendation that any political-office aspirant should undergo a compulsory psychiatric test before getting a ticket to contest for an election, a maximum security be based in chambers and houses of parliaments and strong punitive measures be taken to those legislatures expressing the act of violence in the house of law making. Keywords: Behavioural;psychology;legislature;science;law-making andnarcissism