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Lets be honest here, the customer is never right, you know it, I know it and the customer themselves know it but that does mean that you need to make them feel that they are right. You cant openly tell a customer that you are wrong but instead of that we need to put ourselves in their place to better understand their needs and why they feel that they are right and once the factors of time, money, safety and business disagreements arise thats when you need to step up and let them know in the most polite and professional way that they are wrong but we're still here to help you.
Your relationship with customer should be at that level where you can satisfy their needs without investing.
Strongly Disagree but practically it is.....