In a design and build project, model change monitoring is a big topic which will affect the whole construction and design life. A good monitoring of the model change can effectively find out the potential issues of the change and trase the issues directly and immediately. In this blogger, I will like to share the method to monitor the model change of structure model whcih already successfully used in my project. Then, I will share some possible method to monitoring the model change of architecture model and MEP model and the difficulties in my project. Ready previous structure model and current model In my project, we will compare the model bi-weekly. So first I will prepare the structure model in last bi-weekly and model in current bi-weekly. Create Automation to extract the geometry data In my project, I use dynamo to extract XYZ location and size of beam, column, slab and bearing wall of both previous and current model.