> For the complete documentation index, see [llms.txt](https://learn.moselle.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://learn.moselle.io/planning-and-execution/forecasting/phase-1-understand-forecasting.md).

# Phase 1: Understand Forecasting

Before building your first forecast, it helps to understand how Mo generates demand projections and what the key concepts mean. The pages in this section give you that foundation.

{% content-ref url="/pages/KXh7MTxw84WmaJhhHp6g" %}
[How Mo's Forecasting Works](/planning-and-execution/forecasting/phase-1-understand-forecasting/how-mos-forecasting-works.md)
{% endcontent-ref %}

**How Mo's Forecasting Works** — How Mo turns your sales history into a directional forecast.

{% content-ref url="/pages/mpXIdcppjHO1UYCYrGXr" %}
[Forecast vs. Plan](/planning-and-execution/forecasting/phase-1-understand-forecasting/forecast-vs-plan.md)
{% endcontent-ref %}

**Forecast vs. Plan** — The difference between a forecast and a replenishment plan, and how they connect.

{% content-ref url="/pages/jzk90k9YoMWK7XMHLRVq" %}
[Sell-In vs. Sell-Through](/planning-and-execution/forecasting/phase-1-understand-forecasting/sell-in-vs-sell-through.md)
{% endcontent-ref %}

**Sell-In vs. Sell-Through** — Which data type Mo uses and how to submit your sell-through reports.

***

Once you're comfortable with the basics, move on to [Phase 2: Build Your Forecast](/planning-and-execution/forecasting/phase-2-build-your-forecast.md).