The dictionary defines assertiveness as, "confidently self assured” a fairly good description of what most of us hope to be, confident and self assured. The question always becomes am I assertive? Am I too assertive? Am I assertive to the point of being aggressive? No one wants to be known as aggressive just as they do not want to be known as a push over. The goal is to find that fine line in between too much and too little assertiveness. Balance if you will, so that you know when to let go or when to give a little bit.
The study of assertiveness has a lot to do with how you establish personal boundaries for yourself and for others around you. Most people fall into three categories the first being passive where they let people overcome their personal boundaries. If you are one of these people you probably find yourself saying yes to things you do not want to do or letting others take credit for your work. Most of the time you fall into these traps because you are afraid to speak up for yourself. This sort of behavior leaves you feeling manipulated and abused. If you see yourself as the victim in many scenarios then you might be too passive.
Perspiciatis unde omnis iste natus error