When a project is completed, its SV is always 0 and SPI is always 1, even if the project was delivered unacceptably late. Similarly, a project can languish near completion (e.g. SPI = 0.95) and never be flagged as outside acceptable numerical tolerance.
When a project is finished, its SV is always 0 and SPI is always 1, even if it was delivered unacceptably late. Conversely, a project can almost be complete (e.g. SPI = 0.95) without being flagged as outside acceptable numerical limits.