Precedence Diagramming Methods – Different Calculation Methods

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When we start calculating the Early Start and Early Finish, we can start from 0 or 1.
Some people prefer to start from 0, while others prefer to start from 1. Although both ways look different, basically, they have the same result.

In the original Arrow Diagramming Method, the start and finish of activities and the project are given by events. Events are moments in time with duration 0 like milestones. The initial event is the start of the project. From here activities start and they end in other events. The events are points in time and the calculations starting from 0 are the logical approach.

However, with the introduction of the precedence diagramming method, calculations were done related to periods like days, weeks, or months. Day, Week, or Month 0 do not exist and the start and finish dates relate to days, weeks, or months. The first day of the year is 1.1.2020 (for this year) and there is no date 0.1.2020. Here, it is logical to calculate days and not events.

Understanding the differences and the similarities between both methods will help you completing the precedence calculations.

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