The level of directness in speech varies greatly across cultures, and this can lead to miscommunication, misinterpretation of motivations, and hard feelings. the cultural dimension of deals with the level of confrontation and directness that is considered appropriate and productive.

assertiveness  

Explanation:

                  Cultural dimension of assertiveness means the degree to which people are confrontational and assertive in their relationship with others. There are huge differences between cultures and beliefs among the various regions around the world. People have their own cultures and traditions around the world. These cultural differences creates many miscommunications and hard feelings among the people.

               The cultural dimension of assertiveness is a tool to deal with the cultural differences around the world and is most productive and appropriate.

Thus the answer is --

assertiveness