better environments (e.g., culture, infrastructure, special tax zones, or sophisticated OEM) for their products. There are many additional challenges when the scope of supply chains is global. This is because with a supply chain of a larger scope, the lead time is much longer, and because there are more issues involved, such as multiple currencies, policies, and laws. The consequent problems include different currencies and valuations in different countries, different tax laws, different trading protocols, vulnerability to natural disasters and cyber threats, and lack of transparency of cost and profit. Roles and responsibilities Supply chain professionals play major roles in the design and management of supply chains. In the design of supply chains, they help determine whether a product or service is provided by the firm itself (insourcing) or by another firm elsewhere (outsourcing). In the management of supply chains, supply chain professionals coordinate production among multiple providers, ensuring that production and transport of goods happen with minimal quality control or inventory problems. One goal of a well-designed and maintained supply chain for a product is to successfully build the product at minimal cost. Such a supply chain could be considered a competitive advantage for a firm. Beyond design and maintenance of a supply chain itself, supply chain professionals participate in aspects of business that have a bearing on supply chains, such as sales forecasting, quality management, strategy development, customer service, and systems analysis. Production of a good may evolve over time, rendering an existing supply chain design obsolete. Supply chain professionals need to be aware of changes in production and business climate that affect supply chains and create alternative supply chains as the need arises. In a research project undertaken by Michigan State University's Broad College of Business, with input from 50 participating organizations, the main issues of concern to supply chain managers were identified as capacity/resource availability, talent (recruitment), complexity, threats/challenges (supply chain risks), compliance and cost/purchasing issues. Keeping up with frequent changes in regulation was identified as a particular concern. Complexity within supply chains has also been highlighted in Supply Chain Digest and by Gartner as a perennial challenge. Supply chain consultants may provide expert knowledge in order to assess the productivity of a supply-chain and, ideally, to enhance its productivity. Supply chain consulting involves the transfer of knowledge on how to exploit existing assets through improved coordination and can hence be a source of competitive advantage: