Besides a production environment, the 'Theory of Constraints' concept can also be applied to a service business setting.

A local courier company is experiencing growing issues with its delivery drivers not being able to fulfill their daily assigned parcel deliveries within their 8 hours shifts on every weekday. As a result, complaints have risen from customers about increased waiting times for scheduled delivery of their items.

Required:

(a) Identify two possible constraints that might prevent the delivery drivers from completing all their daily deliveries.

(b) Explain how each of the possible constraints could be elevated.