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Oct 19, 2008 · The behavior of the CPI(t) and SPI(t) curves over time for most projects should be similar to those shown in Exhibit 6. Therefore, as long as a project's labor curve is the usual “S” shape, the conclusion is that the shape of the CPI(t) and SPI(t) curves will follow that shown in Exhibit 6. Early Estimation of Cost and Schedule Over-runs. The Consumer Price Index (CPI) rose 1.3% this quarter. Over the twelve months to the December 2021 quarter, the CPI rose 3.5%. The most significant price rises were for New dwelling purchase by owner-occupiers (+4.2%) and Automotive fuel (+6.6%). What's new this quarter This issue includes the introduction of updated CPI weighting patterns.