The video introduces a method of assertiveness that involves allowing the natural consequences of someone's behavior to occur without interference. This approach is compared to the 'let them' theory but is considered superior as it provides context. The method involves observing the behavior, considering the consequences if no action is taken, and optionally communicating these consequences to the person involved. This technique is rooted in the work of Austrian psychiatrist Rudolf Dreikurs, who used it to teach children self-directed behavior change. The video explains that traditional methods like punishment, reward, and logical persuasion often fail because they don't encourage personal responsibility or autonomy. Instead, highlighting logical consequences allows individuals to learn from their actions naturally. Examples are provided for both children and adults, illustrating how to apply this method in various situations. The video also discusses the difference between healthy and unhealthy ultimatums, emphasizing that healthy ultimatums are respectful and non-threatening.