E-mail : bshardi@plasa.com Keywords: fault tree, fishbone diagram. Bambang Suhardi ∗∗∗∗ Jurusan Teknik Industri, Universitas Sebelas Maret, Surakarta Performa (2004) Vol. 3, No.2: 55-61 ∗ Gambar 1. Diagram Sebab Akibat Penyebab Akibat 56 Performa (2004) Vol. 3, No.2