Abstract: A system repetitively verifies a quantity of items against a baseline quantity of items, and manages the baseline quantity of items at the same time. A display processor initiates generation of data, representing a display image on a user interface. The display image presents a pre-populated list of item types and associated quantities derived from a first source. The display image also presents individual data fields corresponding to individual item types of the list. An individual data field receives data representing a user entered quantity value representing a count of items of an individual item type. A data processor compares a user entered quantity value with a pre-populated quantity, and generates data representing a message in response to a difference determined by the comparison.