In summary, EVM strategically augments good project management to facilitate the planning and control of cost and schedule performance. The key practices of EVM include: ● Establish a performance measurement baseline (PMB) Decompose work scope to a manageable level Assign unambiguous management responsibility Develop a time-phased budget for each work task Sel-ect EV measurement techniques for all tasks Maintain integrity of PMB throughout the project. ● Measure and analyze performance against the baseline Record resource usage during project exe-cution Objectively measure the physical work progress Credit EV according to EV techniques Analyze and foreca-st cost/schedule performance Report performance problems and/or take action.
Earned Value Management (EVM) relies on three key data points: ● Planned Value PV是你打算花费的资源，主要基于甘特图。 比如你在第一个月打算花100元 第二个月100元 第三个月150元 那么： 第一个月的PV是：100 第二个月的PV是：200 （第一个月的预算100加上第二个月的100） 第三个月的PV是：450（第一个月的预算100加上第二个月的100再加上第三个月的150）
DESCRIPTIONS OF THE BASIC EVM ELEMENTS Planned Value Planned Value (PV) describes how far along project work is supposed to be at any given point in the project schedule. It is a numeric reflection of the budgeted work that is scheduled to be performed, and it is the established baseline (also known as the performance measurement baseline, or PMB) against which the actual progress of the project is measured. Once established, this baseline may only change to reflect cost and schedule changes necessitated by changes in the scope of work. Also known as the Budgeted Cost of Work Scheduled (BCWS), Planned Value is usually cha-rted showing the cumulative resources budgeted across the project schedule. Figure 2-1 shows the Planned Value S-Curve for Project EZ.
Earned Value Earned Value (EV) is a snapshot of work progress at a given point in time. Also known as the Budgeted Cost of Work Performed (BCWP), it reflects the amount of work that has actually been accomplished to date (or in a given time period), expressed as the planned value for that work. Figure 2-2 shows the Earned Value for Project EZ at the four-month mark, and indicates that less work than planned has been accomplished 没办法贴不了图，大家自己去猜到底是怎么样。
Actual Cost Actual Cost (AC), also known as the Actual Cost of Work Performed (ACWP), is an indication of the level of resources that have been expended to achieve the actual work performed to date (or in a given time period). Figure 2-3 shows the Actual Cost for Project EZ at the four-month mark, and indicates that the organization has spent less than it planned to spend to achieve the work performed to date.
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