I will mainly talk about customer input sources. Every organization actually has two different types of customers: Internal Customers and External Customers.Most people are familiar with their external customers – these are your end users and even your intermediate users (dealers, distributors, brokers, etc).
If you’re in a regulated industry (and which ones aren’t these days), you’ll have Regulatory Agencies as another type of external customer.Your other customer, those internal ones, are extremely important when you’re designing a new product, process or service.For example, the manufacturability of your design or the serviceability of your design are very important to your internal customers (the manufacturing team or the service team)