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The answer lies in your question.
How would you know that you have achieve good customer service? It a bout 'Managing Expectation', isn't it? First of all, you need to plan a strategy and mitigate your customers expectation, understand it.
If you do not know how, then create a 'Customer Feedback' form and get customers to write to you what they think about your service and rate between1-10. Tabulate the information into a template to evaluate the success rate and you will understand where you are and work things out for improvement. That is how we manage expectation.
Gathering feedback through various mediums is a very good strategy for any customer service provider. It forms backbone of the after sale services, etc. If your brand has loyal customers they form the base of it because they come up with honest feedback and suggestions. A loyal customer is key for new business. It is always better to go for wealth maximization in the first place rather than profit maximization because it helps to build base; stronger the base stronger shall be the building.
Meeting your expectations and objectives and evolving those to your role to exceed them, reviewing areas of improvement and understanding the customers to evolve your role.