![]() ![]() Critical Activity: Any activity in the schedule that does not possess any float Total Float=0.Activity-on-Node (AON) diagram: A basic type of a logic diagram used in scheduling.Terms and abbreviations, which are shown in parenthesis, are listed below. However before the discussion on the calculation process used to determine planned start/finish dates for activities, schedule duration, and float values for each activity is initiated, an explanation of basic scheduling terminology is in order. Also, through comprehension of float values and their definitions, managers will be able to apply this knowledge in their schedule analysis should a delay occur on the project.Ī schedule graphically illustrates the intended flow of the work sequence and will designate the planned start/finish dates for activities once they are calculated. By doing so, project managers will recognize how activity-sequencing affects planned start/finish dates for activities and the duration of the schedule. It is the belief of the authors that personnel in their respective construction companies must become knowledgeable in the schedule calculation process in order to fully understand the importance of schedules. However, these options are not addressed in the basic scheduling discussion of this paper. One should note that schedules could also be structured to show other types of information such as budgeted costs or labor quantities. In addition, schedules also show the planned start/finish dates for activities, schedule duration, and float values for the individual activities on the project. It is through these schedules that the logical flow of the work sequence is graphically illustrated. Activity-on-Node (AON) schedules show the Critical Path of the schedule, and thus are considered to be CPM Schedules. Critical Path Method (CPM) schedules have evolved into valuable management and communication tools for today's complex projects. Since the advent of computers, managers have generated schedules for their projects through computer scheduling software packages. This paper will discuss the basic terminology of scheduling and illustrate how values are calculated using the Activity-on-Node (AON) calculation methods. And to fully understand these basic terms, one must learn how their values are calculated. It is the belief of the authors, that in order for construction management personnel to understand schedules and become successful in their careers, they need a thorough understanding of basic scheduling terms. While important terms such as the Early Start Dates, Late Finish Dates, Total Float, or Critical Path commonly appear on computer generated schedules, project managers might not fully understand what they really mean! As a result, decisions made by management based on this lack of knowledge may not be as effective as they could have been. In today's business world of complex projects, managers can get lost in the plethora of information provided by the project schedule. Schedules are used as management tools to communicate work sequence, dictate start/finish dates for activities, and to track progress on just about every type of project. AON (Activity-on-Node) logic networks will be discussed. Example schedules are presented to show how durations and activity relationships are used to calculate start/finish dates and float values for activities. You've used a computer to generate a schedule, but have you ever wondered what the terms Early Start, Late Finish, Total Float, or Critical Path really mean? This paper offers a look at basic scheduling terminology by guiding the reader through basic schedule calculations.
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