FROM SUPPLIERS
INTERNAL: Internal suppliers are those people who supply you and your unit with materials, resources, advice, information, expertise etc. They usually work in departments like accounting, human resources, purchasing, IT, marketing and so on. Without their support, it is usually difficult and sometimes impossible to succeed. These relationships are usually tested most dramatically in emergencies. A wise manager will build the kind of relationships that make suppliers want to help them to succeed.
EXTERNAL: External suppliers are those people who supply many of the same things listed above but who work outside of your organization. They could be suppliers of products or services that are essential for your operation. These people also can make or break you in a crisis. While sometimes there are alternative sources, long-term relationships with trusted suppliers often a part of a strategic business model.