LEGION Model Builder is where you construct the site or venue you want to simulate for the ultimate aim of producing analyses about pedestrian usage. It is here where you import CAD, add Spatial Objects, define linking methods, set up conditions and introduce demand data.

To this end, it enables you to bring together the following elements:

• CAD drawings of the site to be simulated and analysed.
• Data about how many pedestrians are using the site.
• Entities (the types of pedestrian using the site).
• Activity Objects to define the activities of Entities engaging with the site; to introduce operational route restrictions, designate special routes, or complement Entities' navigation.
• Analysis Objects so that you can create 'Conditional' and 'Reporting' analyses.

This part of the guide concentrates on introducing LEGION Model Builder and some key basic tasks. Subsequent sections discuss more detailed aspects of model building.