Cross-docking reduces inventory investment by minimizing the time goods spend in storage. Instead of holding inventory in a distribution center, products are directly transferred from inbound to outbound transportation with little to no storage time. This approach improves inventory turnover, reduces storage costs, and ensures a more efficient flow of goods through the distribution network, leading to faster fulfillment times and reduced inventory levels.
References:
"Cross-Docking: A Supply Chain Strategy," Logistics Bureau.
"The Benefits of Cross-Docking in Supply Chain Management," Supply Chain 24/7.

Bar codes and Radio Frequency Identification (RFID) systems are critical technologies in supply chain systems because they:
* Data Acquisition: Enable the timely and accurate capture of data related to inventory, shipments, and other supply chain activities.
* Tracking: Provide real-time visibility into the location and status of items within the supply chain.
* Efficiency: Reduce manual data entry errors and streamline processes such as receiving, inventory management, and order fulfillment.
Tracking truck locations on cross-country deliveries (A) is typically done using GPS technology. Providing paperless invoicing of goods (C) and producing schedule broadcasts for suppliers (D) are not primary functions of bar codes and RFID systems.
References
* "RFID in Logistics: A Practical Introduction" by Erick C. Jones and Christopher A. Chung.
* APICS Dictionary, 16th edition.

In a supply chain, a high level of variability is undesirable because:
* Demand Uncertainty: High variability in demand makes forecasting difficult, leading to inventory imbalances.
* Production Disruptions: Variability in production processes can cause delays, affecting the entire supply chain.
* Increased Costs: Managing variability often requires holding higher safety stocks, leading to increased holding costs.
* Service Level Impacts: Variability can cause stockouts or overstock situations, negatively impacting customer service levels.
* Complexity in Coordination: High variability complicates planning and coordination efforts across the supply chain, reducing overall efficiency.
References:
Chopra, S., & Meindl, P. (2016). Supply Chain Management: Strategy, Planning, and Operation. Pearson.
Simchi-Levi, D., Kaminsky, P., & Simchi-Levi, E. (2008). Designing and Managing the Supply Chain.
McGraw-Hill.

Improving a company's transportation strategy to focus on core manufacturing competencies and reduce costs involves leveraging specialized expertise and optimizing logistics processes. Engaging a third-party logistics (3PL) company is most likely to achieve these objectives due to the following reasons:
* Specialized Expertise: 3PL providers have specialized knowledge and expertise in logistics, which can help streamline transportation processes and improve efficiency.
* Cost Reduction: 3PL companies can offer economies of scale and negotiate better rates with carriers due to their larger volume of shipments, reducing transportation costs.
* Focus on Core Competencies: By outsourcing logistics functions to a 3PL, the company can focus more on its core manufacturing activities, improving overall operational efficiency.
* Flexibility and Scalability: 3PL providers offer flexible solutions that can scale according to the company's needs, accommodating changes in demand without requiring significant capital investment.
:
Council of Supply Chain Management Professionals (CSCMP)
"Logistics & Supply Chain Management" by Martin Christopher