Customer service
The ability to understand other's feelings
Empathy
A written or spoken agreement.
Contract
A degree of how good or bad something is.
Quality
Information about a reaction to a product.
Feedback
Offering of particular prices for something.
Bidding
The capacity of a substance to withstand great force.
Strength
Another word for the feeling of contentment
Satisfaction
A formal discussion between people trying to reach an agreement.
Negotiations
The ability to last over time and to resist wear and tear.
Durability