In assertiveness training, the basic assumption is that each person is allowed to have a different opinion and to express this. It involves clearly understanding what you want from the other person and describing your needs and ideas clearly and respectfully.
The assertive approach to communication also takes into account the needs and feelings of others. The result when using assertiveness skills is that the communication steers away from being overly passive (where one does not get their needs met) or excessively aggressive (where one may get their needs met but without considering the needs of others.)
As opposed to being aggressive or passive, assertiveness has significant advantages, including preserving one’s self-esteem, increasing one’s chance of getting what one wants without alienating others, and preserving relationships at times of conflict.
Psychologists can teach you different techniques that, in conjunction with assertive behaviour, can help you navigate difficult conversations or situations with other people more gracefully and productively.