Cultural competence in human services workers to improve cross-cultural communication is achieved by:

I believe the answer is:  being more adaptable to, and flexible in, choosing how to respond to situations across cultures
Every cultures has a certain unique values and tradition that become the foundation of almost every decision making made by the members of that culture. Since this would most likely affect the outcome of the job, the workers need to be able to adapt to the unique culture that they face on the field.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

producing or giving rise torelating to or engaged in the production of goods, crops, or other commodities.

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.