Tier 1/2/3 Supplier

“Suppliers are ranked by their hierarchy in the chain. Tier 1 suppliers provide full assemblies, and purchase sub-assemblies from Tier 2 suppliers, who purchase components and raw materials from Tier 3 suppliers.”

Software Process Improvement

“Software Process Improvement (SPI) methodology is defined as a sequence of tasks, tools, and techniques to plan and implement improvement activities to achieve specific goals such as increasing development speed, achieving higher product quality or reducing costs.”

Service-Level Agreement [SLA]

A contract between a service provider and its internal or external customers that documents what services the provider will furnish and defines the service standards the provider is obligated to meet.