## 1 Introduction
Processing these configuration data effectively and providing quick reaction to clients' requirements will be the key issue of achieving mass customization strategy in a high-complexity and low volume environment [10; 23; 24]. There has thus far been relatively little research into the area [14; 23]. Studies about acquisition of knowledge, representation of knowledge, analysis of identified knowledge and searching, accessing and sharing knowledge, which are corresponding to order configuration and product design, is at the initial stage of product manufacturing process [9; 12]. The research is still at the early stage in developing product configuration system under Industry 4.0, not to mention a paucity of literature on this subject [13; 14]. The final aspect is about the enhancement and transformation of advanced manufacturing process. Industry 4.0 based technology drive an enhanced enterprise resource planning system and reconfigurable manufacturing system to effectively deal with high variety of knowledge design specifications from orders to achieve product design, product schedule, production control and to fulfill the whole manufacturing procedures. The majority of research in Industry 4.0 based manufacturing issues has focused on this topic [13; 14]. How a company responds in the new environment and how their resources are to be distributed to optimize production and product transactions within their capability are serious issues [19]. It is vital for companies to directly collect dynamic user requirements and make wise decisions in a short period of time. It is expected that a configuration system could benefit companies by transforming customer voice into configurations. However, existing configuration systems are not likely to adapt well to the potential of Industry 4.0 and meet the dynamic customer requirements. Currently, a typical strategy of customization named make-to-order (MTO) is providing selections of subassembly to customers to configure the products themselves and then place their orders [16; 25]. MTO is a business production strategy allowing consumers to purchase products that are customized to their specifications. It is also a manufacturing process in which the production of an item begins only after a confirmed customer order is received, otherwise known as mass customization [16; 25]. An MTO manufacturer starts to work on an order only after it has been placed by the customer. MTO is characterized by back orders with zero inventories as each customer order is unique and cannot be manufactured in advance. Consequently, the main driver in MTO operations is the new transformation under Industry 4.0 about customer orders [26; 27]. In view of the various products and changing demand, companies adopt MTO and quick response manufacturing (QRM) strategies to be able to respond quickly to user demand through the quick design and production of products. Quick response (QR) is a management concept created to increase consumer satisfaction by shortening the lead time from receiving an order to delivering the product, increasing the cash flow. In this process, manufacturers do not actually hear from customers directly but only receive the orders they place [28]. Yet, customers may not know whether their choices will satisfy their needs, and manufacturers may provide insufficient selections without knowing what customers really need [29]. In addition, the focus is largely on developing product configuration models to transform fixed, collected customer requirement data into high volume and specific specifications, which fails to consider the practical condition of dynamic, customized order placement from online customers. In summary, a limited number of studies leverage dynamic customer requirements for the order fulfillment and product configuration process of high-complexity products under Industry 4.0 [28; 30; 31; 32].