modal4d4D construction simulation can help increase on-site efficiency and improve communication. Ken Flannan shares use cases and workflows—and peeks into the 5D future.Teknika : 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