Word of mouth is an effective and cheap way of marketing your business. It also can be detrimental to your business if the wrong message gets out there.
The Net Promoter Score (NPS) is a system that makes it easy to determine the potential of a customer to recommend your business to a friend or colleague. It's also a way to see if they think negatively or positively about your business. An NPS survey is a quick way to gather customer insight on this data.
See NPS Survey