--- title: How does the Replenishment module work? description: The Replenishment module allows stock to be sent to each store of an existing product in warehouse. --- [Skip to content](https://help.nextail.co/en/legacy/how-does-the-replenishment-module-work#main-content) - [English](https://help.nextail.co/en/legacy/how-does-the-replenishment-module-work) - [Español](https://help.nextail.co/es/legacy/cómo-funciona-el-módulo-de-reposición) - [Français](https://help.nextail.co/fr/legacy/comment-fonctionne-le-module-de-réassort) - [Русский](https://help.nextail.co/ru/legacy/как-работает-модуль-подсортировка) English Show submenu for translations ![Nextail-logo-rojo (5).png\]](https://help.nextail.co/hs-fs/hubfs/Emails/Nextail-logo-rojo%20(5).png?height=31&name=Nextail-logo-rojo%20(5).png) Open main navigation Close main navigation - - [English](https://help.nextail.co/en/legacy/how-does-the-replenishment-module-work) - [Español](https://help.nextail.co/es/legacy/cómo-funciona-el-módulo-de-reposición) - [Français](https://help.nextail.co/fr/legacy/comment-fonctionne-le-module-de-réassort) - [Русский](https://help.nextail.co/ru/legacy/как-работает-модуль-подсортировка) English Show submenu for translations - [Visit nextail.co](https://nextail.co/) [Visit nextail.co](https://nextail.co/) How can we help you? - There are no suggestions because the search field is empty. 1. [Knowledge base (Legacy)](https://help.nextail.co/en/legacy?hsLang=en) 2. [Nextail Optimization Logic](https://help.nextail.co/en/legacy/nextail-optimization-logic?hsLang=en) 3. [Frequently asked questions](https://help.nextail.co/en/legacy/nextail-optimization-logic?hsLang=en#frequently-asked-questions) # How does the Replenishment module work? ## The Replenishment module allows stock to be sent to each store of an existing product in warehouse. The algorithm in this module is based on some principles that help us understand how it works: - **Demand**  All calculations are based on the sales probability of an item in each store each day. - **Global optimization** [The replenishment cycle](https://offers.nextail.co/en/kb/replenishment-cycles?hsLang=en)is calculated as a whole, to achieve the global optimum. - **Robustness over accuracy**  Avoiding big mistakes takes precedence over increasing accuracy in most cases. - **Meritocracy**  The starting point of the replenishment calculation is the existing stock, not store demand. - **Rich constraints set**  Several types of [constraints](https://offers.nextail.co/en/kb/replenishment-restrictions-before-executing-a-scenario?hsLang=en)can be configured and considered. 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