Angry, too, need the rules. If you would like to express their outrage, we must carefully choose the words and expressions that you are going to use it. Words can inflict a very strong emotional wound. Always remember that. And even in anger. Even if you are very angry, you should try to remain calm. Then you will be easier to formulate their claims. Do not focus on the process itself. Do not forget in the heat of anger, what you're angry, why are you angry, what goals you want to achieve, expressing their outrage.
You must also show that you are not satisfied with the personality of man, and his specific act or situation, in which he has put you. You should not insult the man. No need to remember all his faults, which are not relevant to the subject of your anger. Moreover, it is impossible to point to some external features of the man.
It is not advisable to show anger towards his boss. You do not reach the wrath of their goals. But you can lose a job.
If you are the boss, then you can afford to be angry at his negligent subordinates. But it is necessary to comply with all regulations. We must not go beyond appearances.
Anger can have different degrees. But the highest degree of your anger should be used very rarely.