1# Overview<a name="EN-US_TOPIC_0000001128311060"></a> 2 3The mini and small OpenHarmony systems are suitable for IoT devices with limited memory. This document describes the system development with three typical development boards: Hi3861 WLAN module, Hi3516D V300, and Hi3518E V300. 4 5With this document, you will quickly get familiar with environment setup, build, burning, debugging, and simple app and driver development for mini and small systems. 6 7