# Overview

This section describes the basic operation of the Interface level building blocks. Figure 4-2, below, provides a road map for the section.

In the section, you'll learn:

- The purpose of each building block.

- How to select and place each building block.

- How to do building block operations on the map surface.

- How to operate the building block's dialog.

Important Note: When creating a High-Level Map, you may choose either to have the software enforce a one-to-one correspondence with the diagram or not. If "Link High-Level Map to Model" is checked in the Interface Prefs dialog or in the Default Settings, the software will not run a model until your Process Frame/Bundled Flow Connector Map on the Interface level is in one-to-one correspondence with your Sector Frame/ stock/ flow/ converter/ connector diagram on the Map/Model level. When the link is not checked, you may build the structures independently of each other.

Figure 4-2 An Overview of Mapping Building Blocks