DAFTAR ISI Halaman ABSTRAK... KATA PENGANTAR... DAFTAR ISI... DAFTAR GAMBAR... DAFTAR TABEL... DAFTAR LAMPIRAN... vii viii x xii xvi xix BAB I PENDAHULUAN... 1 1.1 Latar Belakang... 1 1.2 Perumusan Masalah... 4 1.3 Pembatasan Masalah... 5 1.4 Tujuan... 5 1.5 Manfaat... 6 1.5 Sistematika Penulisan... 7 BAB II. LANDASAN TEORI... 9 2.1 Persediaan dan Pengendalian Persediaan... 9 2.2 Fungsi Persediaan... 10 2.3 Make To Stock... 12 2.4 Peramalan atau Forecasting... 12 2.5 Metode Single Exponential Smoothing (SES)... 18 2.6 Metode Double Exponential Smoothing (HOLT)... 19 2.7 Metode Triple Exponential Smoothing (WINTER)... 20 2.8 Pengukuran Kesalahan Peramalan... 21 x
2.9 Reorder Point (ROP)... 23 2.10 Desain... 24 2.11 System Development Life Cycle... 28 2.12 Pengujian Black Box... 31 BAB III. ANALISIS DAN PERANCANGAN SISTEM... 34 3.1 Analisis Sistem... 34 3.2 Perancangan Sistem... 38 3.3 Perancangan Desain Input Output... 70 3.4 Desain Uji Coba... 81 BAB IV. IMPLEMENTASI DAN EVALUASI... 87 4.1 Implementasi dan Kebutuhan Sistem... 87 4.2 Implementasi Sistem... 88 4.3 Uji Coba Sistem... 97 4.4 Evaluasi Sistem... 116 BAB V. PENUTUP... 119 5.1 Kesimpulan... 119 5.2 Saran... 119 DAFTAR PUSTAKA... 121 LAMPIRAN... 122 xi
DAFTAR GAMBAR Halaman Gambar 1.1 Grafik Penjualan... 4 Gambar 2.1. Pola Data... 18 Gambar 2.2 Hubungan One-to-one... 27 Gambar 2.3 Hubungan One to-many... 27 Gambar 2.4 Hubungan Many to-one... 28 Gambar 2.5 Hubungan Many to-many... 28 Gambar 2.6 System Development Life Cycle (SDLC) Model Waterfall... 29 Gambar 3.1 Block Diagram Pengendalian Persediaan Bahan Baku... 39 Gambar 3.2 Flowchart Metode Single Exponential Smoothing (SES)... 42 Gambar 3.3 Flowchart Perhitungan Nilai Error Metode Single Exponential Smoothing (SES)... 43 Gambar 3.4 Flowchart Metode Double Exponential Smoothing (HOLT)... 44 Gambar 3.5 Flowchart Perhitungan Nilai Error Metode Double Exponential Smoothing (HOLT)... 45 Gambar 3.6 Flowchart Metode Trilple Exponential Smoothing (WINTER)... 46 Gambar 3.7 Flowchart Perhitungan Nilai Error Metode Triple Exponential Smoothing (WINTER)... 47 Gambar 3.8 Document Flow Pengecekan Persediaan Bahan Baku... 48 Gambar 3.9 Document Flow Proses Produksi... 50 Gambar 3.10 System Flow Perhitungan Peramalan... 52 Gambar 3.11 System Flow Perhitungan Peramalan Metode SES... 54 Gambar 3.12 System Flow Perhitungan Peramalan Metode HOLT... 55 Gambar 3.13 System Flow Perhitungan Peramalan Metode WINTER... 57 xii
Gambar 3.14 System Flow Perhitungan Reorder Point (ROP)... 59 Gambar 3.15 HIPO Aplikasi Pengendalian Persediaan Bahan Baku... 61 Gambar 3.16 Context Diagram Pengendalian Persediaan Bahan Baku... 62 Gambar 3.17 Data Flow Diagram Level 0 Pengendalian Persediaaan Bahan Baku... 63 Gambar 3.18 Data Flow Diagram Level 1 Pengendalian Persediaaan Bahan Baku...... 64 Gambar 3.19 Conceptual Data Model Aplikasi Pengendalian Persediaan Bahan Baku... 65 Gambar 3.20 Physical Data Model Aplikasi Pengendalian Persediaan Bahan Baku... 66 Gambar 3.21 Form Login... 70 Gambar 3.22 Form Menu Utama... 71 Gambar 3.23 Form User... 71 Gambar 3.24 Form Permintaan Pelanggan Softcase 10... 72 Gambar 3.25 Form Permintaan Pelanggan Softcase 11,6... 73 Gambar 3.26 Form Permintaan Pelanggan Softcase 12... 74 Gambar 3.27 Form Permintaan Pelanggan Softcase 14... 75 Gambar 3.28 Form Bahan Baku... 76 Gambar 3.29 Form Perhitungan Peramalan... 77 Gambar 3.30 Form Reorder Point... 78 Gambar 3.31 Laporan Hasil Peramalan... 79 Gambar 3.32 Laporan Kebutuhan Bahan Baku... 80 Gambar 3.33 Laporan Reorder Point... 80 Gambar 4.1 Form Login... 88 xiii
Gambar 4.2 Form Menu... 89 Gambar 4.3 Form User... 89 Gambar 4.4 Form Permintaan Pelanggan Softcase 10... 90 Gambar 4.5 Form Permintaan Pelanggan Softcase 11,6... 91 Gambar 4.6 Form Permintaan Pelanggan Softcase 12... 91 Gambar 4.7 Form Permintaan Pelanggan Softcase 14... 92 Gambar 4.8 Form Bahan Baku... 93 Gambar 4.9 Form Perhitungan Peramalan... 94 Gambar 4.10 Form Reorder Point (ROP)... 94 Gambar 4.11 Form Cari Bahan Baku... 95 Gambar 4.12 Form Laporan Hasil Peramalan... 95 Gambar 4.13 Form Laporan Kebutuhan Bahan Baku... 96 Gambar 4.14 Form Laporan Reorder Point (ROP)... 96 Gambar 4.15 Hasil Login Sukses... 97 Gambar 4.16 Hasil Simpan Data User Sukses... 98 Gambar 4.17 Hasil Ubah Data User Sukses... 98 Gambar 4.18 Hasil Hapus Data User Sukses... 99 Gambar 4.19 Hasil Simpan Data Permintaan Pelanggan Sukses... 100 Gambar 4.20 Hasil Ubah Data Permintaan Pelanggan Sukses... 100 Gambar 4.21 Hasil Hapus Data Permintaan Pelanggan Sukses... 101 Gambar 4.22 Hasil Simpan Data Bahan Baku Sukses... 102 Gambar 4.23 Hasil Ubah Data Bahan Baku Sukses... 102 Gambar 4.24 Hasil Hapus Data Bahan Baku Sukses... 103 xiv
Gambar 4.25 Hasil Perhitungan Peramalan Tiga Metode Softcase 10... 104 Gambar 4.26 Hasil Pemilihan Metode Peramalan Softcase 10... 105 Gambar 4.27 Hasil Perhitungan Peramalan Tiga Metode Softcase 11,6... 106 Gambar 4.28 Hasil Pemilihan Metode Peramalan Softcase 11,6... 106 Gambar 4.29 Hasil Perhitungan Peramalan Tiga Metode Softcase 12... 108 Gambar 4.30 Hasil Pemilihan Metode Peramalan Softcase 12... 108 Gambar 4.31 Hasil Perhitungan Peramalan Tiga Metode Softcase 14... 110 Gambar 4.32 Hasil Pemilihan Metode Peramalan Softcase 14... 110 Gambar 4.33 Hasil Cari Bahan Baku... 111 Gambar 4.34 Hasil Perhitungan Reorder Point (ROP)... 112 Gambar 4.35 Hasil Simpan Reorder Point (ROP) Sukses... 112 Gambar 4.36 Hasil Ubah Reorder Point (ROP) Sukses... 113 Gambar 4.37 Hasil Hapus Reorder Point (ROP) Sukses... 113 Gambar 4.38 Hasil Laporan Hasil Peramalan... 114 Gambar 4.39 Hasil Laporan Kebutuhan Bahan Baku... 115 Gambar 4.40 Hasil Laporan Reorder Point (ROP)... 115 xv
DAFTAR TABEL Halaman Tabel 2.1 Flow Direction Symbols... 24 Tabel 2.2 Processing Symbol... 25 Tabel 2.3 Input / Output Symbol... 25 Tabel 2.4 Data Flow Diagram Symbol... 26 Tabel 3.1 Penjelasan Document Flow Pengecekan Persediaan Bahan Baku... 49 Tabel 3.2 Penjelasan Document Flow Proses Produksi... 51 Tabel 3.3 Penjelasan SystemFlow Perhitungan Peramalan... 53 Tabel 3.4 Penjelasan SystemFlow Perhitungan Peramalan Metode SES... 54 Tabel 3.5 Penjelasan SystemFlow Perhitungan Peramalan Metode HOLT... 56 Tabel 3.6 Penjelasan SystemFlow Perhitungan Peramalan Metode WINTER... 58 Tabel 3.7 Penjelasan System Flow Perhitungan Reorder Point (ROP)... 60 Tabel 3.8 User... 66 Tabel 3.9 Data Permintaan Pelanggan... 67 Tabel 3.10 Data Permintaan Pelanggan S10... 67 Tabel 3.11 Data Permintaan Pelanggan S11... 67 Tabel 3.12 Data Permintaan Pelanggan S12... 68 Tabel 3.13 Peramalan... 68 Tabel 3.14 Hasil Peramalan... 69 Tabel 3.15 Data Bahan Baku... 69 Tabel 3.16 Data Kebutuhan Bahan Baku... 69 Tabel 3.17 ROP... 70 xvi
Tabel 3.18 Uji Coba Form Login... 81 Tabel 3.19 Uji Coba Form Menu Utama... 81 Tabel 3.20 Uji Coba Form User... 82 Tabel 3.21 Uji Coba Form Permintaan Pelanggan Softcase 10... 83 Tabel 3.22 Uji Coba Form Permintaan Pelanggan Softcase 11,6... 83 Tabel 3.23 Uji Coba Form Permintaan Pelanggan Softcase 12... 84 Tabel 3.24 Uji Coba Form Permintaan Pelanggan Softcase 14... 84 Tabel 3.25 Uji Coba Form Bahan Baku... 85 Tabel 3.26 Uji Coba Form Peramalan... 85 Tabel 3.27 Uji Coba Form Reorder Point... 86 Tabel 4.1 Hasil Uji Coba Login... 97 Tabel 4.2 Hasil Uji Coba Form User... 97 Tabel 4.3 Hasil Uji Coba Form Permintaan Pelanggan... 99 Tabel 4.4 Hasil Uji Coba Form Bahan Baku... 101 Tabel 4.5 Hasil Uji Coba Form Perhitungan Peramalan Softcase 10... 103 Tabel 4.6 Hasil Uji Coba Form Perhitungan Peramalan Softcase 11,6... 105 Tabel 4.7 Hasil Uji Coba Form Perhitungan Peramalan Softcase 12... 107 Tabel 4.8 Hasil Uji Coba Form Perhitungan Peramalan Softcase 14... 108 Tabel 4.9 Hasil Uji Coba Form Reorder Point (ROP)... 110 Tabel 4.10 Hasil Uji Coba Form Laporan Hasil Peramalan... 114 Tabel 4.11 Hasil Uji Coba Form Laporan Kebutuhan Bahan Baku... 114 Tabel 4.12 Hasil Uji Coba Form Laporan Reorder Point (ROP)... 115 Tabel 4.13 Simulasi Data Ke-25 Softcase 10... 116 xvii
Tabel 4.14 Simulasi Data Ke-25 Softcase 11,6... 116 Tabel 4.15 Simulasi Data Ke-25 Softcase 12... 117 Tabel 4.16 Simulasi Data Ke-25 Softcase 14... 117 xviii
DAFTAR LAMPIRAN Halaman Lampiran 1. Nota Order Barang... 122 Lampiran 2. Laporan Peramalan Permintaan Pelanggan... 123 Lampiran 3. Laporan Kebutuhan Bahan Baku... 124 Lampiran 4. Laporan Reorder Point (ROP)... 125 xix