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# Business Requirements Document (BRD) ## 1. Project Overview **Project:** Aplikasi Kasir Retail **Objective:** Sistem penjualan cepat, akurat, stok real-time. **Target User:** Pemilik toko. ## 2. Functional Requirements ### 2.1 Modul Kasir (Point of Sale) * **FR-01: Input Barcode.** Sistem wajib terima input scan barcode. Format: alphanumeric/string. * **FR-02: Pencarian Produk.** Tampilkan detail produk (nama, harga) setelah barcode terdeteksi. * **FR-03: Proses Transaksi.** Sistem hitung total harga, bayar, kembalian. * **FR-04: Kecepatan Transaksi.** Waktu respon input barang < 1 detik. Transaksi selesai cepat. ### 2.2 Modul Inventori * **FR-05: Pengurangan Stok Otomatis.** Stok berkurang otomatis saat transaksi sukses. * **FR-06: Sinkronisasi Real-time.** Data stok kasir dan database sinkron. Mencegah selisih stok. * **FR-07: Laporan Stok.** Tampilkan sisa stok saat ini. ### 2.3 Modul Laporan * **FR-08: Laporan Penjualan.** Ringkasan transaksi harian/mingguan/bulanan. ## 3. Non-Functional Requirements * **NFR-01: Performance.** Latensi rendah untuk scan barcode. * **NFR-02: Reliability.** Data stok akurat (anti-selisih). * **NFR-03: Usability.**
# Functional Specification Document (FSD) ## 1. Functional Requirements ### 1.1 Product Management * **FR-001**: System allow add product. Input: Name, Barcode, Price, Stock. * **FR-002**: System allow edit product details. Update price or stock. * **FR-003**: System allow delete product. Remove from database. ### 1.2 Transaction Processing * **FR-004**: System accept barcode scan. Input via scanner device. * **FR-005**: System add item to cart. Match barcode, retrieve price. * **FR-006**: System calculate total. Sum item prices. * **FR-007**: System process payment. Accept cash, calculate change. * **FR-008**: System finalize sale. Reduce stock, generate receipt ID. ### 1.3 Reporting * **FR-009**: System show real-time stock. Display current quantity per item. * **FR-010**: System log inventory changes. Track deduction per sale. ## 2. Non-Functional Requirements ### 2.1 Performance * **NFR-001**: Transaction complete fast. Latency < 2 seconds. * **NFR-002**: Barcode lookup instant. Response < 500ms. ### 2.2 Data Integrity * **NFR-003**: Stock update atomic. Prevent anti-selisih (discrepancy). * **NFR-004**: Data persist. Save before transac
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