Final answer:
Lance Lackey's role as a supervisor in the IRS's CAS unit represents the specialization element of organizational design, focusing on specific task segmentation to increase efficiency.
Step-by-step explanation:
Lance Lackey, as a supervisor in the Customer Account Services (CAS) unit of the IRS, holds a role that involves ensuring proper filing, processing of submissions, and payments by taxpayers. As such, his job responsibility largely revolves around the specialization element of organizational design. This aspect of organizational design pertains to the specific segmentation of tasks within an organization where individuals or units are specialized in certain areas, allowing for more efficient and skilled work in those areas. Unlike private sector organizations that face the threat of going out of business without effective change, government agencies like the IRS operate under different pressures when it comes to organizational efficiency and responsiveness.