A habit is a practice or routine carried out regularly and it is an automatic response to a specific situation. Good habits can help us reach our full potential and even when results seem minimal and irrelevant at the beginning, if we persevere, good habits can create a noticeable change that can improve the quality of our lives. This book presents us with an effective plan of action to create positive habits, the important groundwork to do this is based on the Four Laws to Modify Behaviour that come from the four phases of any habit: cue , craving, response and reward. It is well known that external stimuli influence our habits, this book will explain how our emotions, beliefs and thoughts influence our behaviour and how the four fundamental pillars remain unchanged even when behaviour changes according to situations. The fundamental, unchangeable principles of human behaviour are the base from which we can start to create long lasting and good habits.