# Overview<a name="EN-US_TOPIC_0000001128311060"></a>

The 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.

With this document, you will quickly get familiar with environment setup, build, burning, debugging, and simple app and driver development for mini and small systems.

