# Introduction

The xViz Gantt Chart provides you with the option to display **Reference Lines** (based on dates) and **Reference Ranges** on the chart thereby giving an indication of where you are in the project and to assess the level of completeness.

**Reference Line** - A date line spanning across all the tasks. Configuration of one date will add the reference line on the Chart.

![Image 1: Reference Line in the xViz Gantt Chart](https://382510089-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FIuuIZWiXEx25eV75hmmJ%2Fuploads%2FeDcItFd1vt04jvr6UfTn%2F0.png?alt=media)

**Reference Band** - Range of continuous dates highlighted in the tasks. Configuring two dates ranges will be highlighted as a band in the chart.

![Image 2: Reference Band in the xViz Gantt Chart](https://382510089-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FIuuIZWiXEx25eV75hmmJ%2Fuploads%2FeGEHAsjVKEn9Z8cqyzki%2F1.png?alt=media)

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We can display the Reference line and Reference Range with Static Approach using the Reference tab which is located in Advance Editor - [Static Approach](https://docs.xviz.com/project-management/reference-lines-and-reference-range/static-approach)
{% endhint %}