Process services. Then, based on the participation of customers. Such a process requires that any client or customer (customers and their belongings) is the input of the process (inputs) or not.
The process of providing that service, see part of that process, it is necessary to have the customer or customer's thing (Customers and their belongings) as factors of the process (Inputs)?
The process, the service, the customer is a major part of the process that it will need to have a customer, or customer's (and their belongings Customers) is a factor of import process (Inputs) or not