Aussie Move is a company providing relocation and removal services for people who need to move within Australia or overseas. Typically the services they provide include the following: go to a customers place and pack their furniture and household belongings as required; transport these goods, either by truck or by container ship, to the location the customer specifies; provide storage at the destination location if required; and deliver the goods to the address as customer requires, and unpack the goods. The manager of Aussie Move found that one of the key challenges is effectively managing its operations in the presence of variability. State two key sources of variability faced by Aussie Move. For each source of variability, explain how the variability makes Aussie Moves operations challenging, and discuss ways to reduce variability.