Geeta, your posts are so good. Kindly keep the good effort.
Assertiveness is a skill and thus can be acquired like all other skills.
Parents should nurture their children to become assertive. Teachers and coaches should coach their students/trainees to become assertive.
Good employers do conduct sessions for their employees/leaders/managers on various skills including assertiveness, persuasion, persistence, group behavior.
Good and effective leaders are assertive. Other way around assertiveness, converts an average/medium level individual into good and effective individual capable of leading. Assertive citizens are asset to their families, society, community and nation.