modal4d4D planning is an industry practice that combines two deliverables many project teams already have: the project schedule and a 3D model. The 4D model allows stakeholdersTeknika : Engineering and Sains Journal ISSN 2579-5422 on Volume 1, Nomor 2, Desember 2017, 111-116 ISSN 2580-4146 print 111 IMPLEMENTASI MODEL FOUR-D (4D) UNTUK