The earned value technique is a commonly used method of performance measurement. It integrates project scope, cost, and schedule measures to help the project management team assess project performance. If a project’s Schedule Performance Index(SPI=EV/PV) value less than 1.0, it means that （ ）.
A、the project is ahead of its planned schedule
B、less work was completed than was planned
C、the cost overrun for work completed
D、the cost under-run of performance to date
挣值技术是一种通用的绩效测量方法。它将项目范围、成本、进度整合在一起，帮助项目管理团队评估项目绩效。SPI值若小于1则表示实际进度落后于计划进度。
earned value technique：挣值技术
performance measurement：绩效测量
integrates：整合
scope：范围
cost：成本
schedule：进度
project management team：项目团队
assess：评估
project performance：项目绩效
Schedule Performance Index(SPI=EV/PV)：进度执行（绩效）指标
less than：小于
ahead：超前
overrun：超支
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