The class size is dictated by two elements: the number of work
stations and the work volume. Experience suggests that all
students need to have access to their own workstations, and two
workstations are dedicated to scanning use (a third must be
shared between functions). The initial classes scanned, created
metadata and submitted for approval six cards (front and back),
but many of these initial canal cards were fairly simple rural
scenes. Given the amount of detail that has emerged in postcards
in later semesters, we have gradually reduced input to three cards
(front and back), because the quality and quantity of the metadata
has increased substantially. The time spent in quality control by
instructors has increased commeasurably, despite having students
doing quality control on their partners’ work.