The Digital Twin (DT) is a tryadic system as a digital representation or a mirror of a physical process or its twin and the intelligence, which connects them. Digital twin technology has many uses, from aerospace to infrastructure and manufacturing. However, when it is looked at the design process, it is seen the digital twin does not impact ways of design thinking. ‘If a digital twin is a mirror image, then how can the digital twin be used to feedforward and feedback that does not yet exist, because it is being designed’ is the question to answer in this research. From the literature review, some ways are called fetal, child, and adult digital twins and probably come closest to the design process with the digital twin. As the digital twins of the fetal and child digital twin have not been operationalized yet, it is needed to put this idea into the theoretical framework. To be meaningful for design, the framework should unite the activities of the design process with the technologies and products of the digital twin. By combining two approaches (the Basic Design Cycle (BDC) activities and the digital twin technologies from Digital Twin Technology Development (DTTD) layers at the city and building levels, we can highlight where and how digital twin technology can be used in the design process. The method is systematized in a descriptive framework, which highlights the use of digital twins in the design process.