Key Performance Indicators ( also known as KPI or Key Success Indicators (KSI) KPI’s help an organization define and measure progress toward organizational goals. Key Performance Indicators are quantifiable measurements, agreed to beforehand, that reflect the critical success factors of an organization. They will differ depending on the organization. A business may have as one of its Key Performance Indicators the percentage of its income that comes from return customers. A school may focus its Key Performance Indicators on graduation rates of its students.