The present invention provides flexible, user-definable call screening processes. In one aspect of the present invention, a dispensing system includes a calibration system, which collects and measures an amount of material dispensed during a calibration routine. The tape carrier also has a bending area for bending the tape carrier therein. An exemplary table for making clamshell-to-container associations comprises a scanner for reading traceability codes and rails for positioning stacks of clamshells proximate to the scanner. Moreover, users can requested a postponed access, wherein the resource or service they are requesting is stored to a server, and available to the user at a later time. The communication error determination means sets in advance, as the error determination time period, a preset first error determination time period in the case of the first communication with the sensors and a preset second error determination time period in the case of communication with the sensors after the first communication with the sensors is normally performed.