Following are the materials presented in the 4th INREC a few days ago: Keynote Speaker Sessions 1_Keynote-Dr. Elias Cisneros 2_Keynote-Dr. Jean Marc Roda 3_Keynote-Ir. Bart W van Assen, MSc 4-Keynote – Dr. Petrus Gunarso 5_Keynote-Prof. Yanto Santosa 6_Keynote-Dr. Prayudi Syamsuri