The Fields section displays the schema view of the data stream being passed between tools. Field order is displayed with Field number, Field Name, Type, Size and Source.
Number: The numerical order in which a field appears in the table.
Name: The name of the data field
Type: The kind of data contained within the field.
Size: The length of the field
Source: Contains the tool or the file the field came from. May also contain additional Metainfo such as a specific dataset from a plugin. The tools that report metainfo include Allocate Input Tool, Allocate Append Tool, CASS Tool, Street Geocoder Tool, R Tool, and tools that calculate drivetimes such as Trade Area Tool, Distance Tool, and Find Nearest Tool.
Description: Demographic tools such as Allocate Input Tool
and Allocate Append Tool will include the full variable name in the description field, indicating the origin of a particular field.