as per the AACE® International Recommended Practice No. 37R‐06 here is how they describe the different levels.
The EPC Level 1 schedule summarizes the overall project for client and management. EPC Level 1 schedules show start and finish dates for the major project phases and key milestones (such as design, procurement, construction, and commissioning and start‐up). Significant contract milestones and project‐specific milestones or activities are included in EPC Level 1 schedules as required by the project execution plan.
EPC Level 2 schedules contain more detailed activities for each of the summary phases previously identified in the Level 1 schedule. This often includes a breakout of the various trades or disciplines responsible for the activities in each phase, the critical procurement activities, the major elements of construction, and general commissioning and start‐up requirements. Generally in the EPC Level 2, this is the first level of scheduled detail where logical links or task relationships may be shown.
EPC Level 3 is the first level where the full use of critical path method (CPM) techniques could be shown effectively. In addition to start and finish dates for each grouping of deliverables or activities within each phase of the project, EPC Level 3 schedules include major review and approval dates as well. Most EPC schedule models are not developed below Level 3 in terms of CPM activity detail, with the intent to keep the schedule broad enough to be described for any specific project. EPC schedule levels are normally limited to Levels 1 through 3, however sometimes an “external” schedule data would be prepared and these external schedules are called “Level 4.”
EPC Level 4 are detailed work schedules and generally would be prepared outside of the CPM software, with correlation to the CPM schedule activities and scope of work. The theory is, that if there is too much detail within the CPM network, the schedule would not only lose its flexibility as a value‐added tool to manage the job, but schedule maintenance would become difficult, due to the greater effort needed to maintain the CPM logic after each progress update. A variety of software tools can be employed to develop work schedules at Level 4 and below: spreadsheets, databases, and word processing are all utilized.
At the end of the day, this is a subjective assessment that will vary by the project you are involved in, the orgnaisation you are reporting these to, and even the people/stakholders who are using your schedule.
So I would say there is no single answer and it needs to be established by you for your particular requirement, however here are some guidance documents that might help you:
The AACE produce two really good recommended practices on this matter, but you need to be a member to access them: 37R-06: Schedule Levels of detail and 27R-03 Schedule Classification System
Member for
16 yearsThank's
Thank's
Member for
20 years 6 monthsBryc,Pat Weaver has posted a
Bryc,
Pat Weaver has posted a picture from the CIOB practice standard for scheduling here: https://mosaicprojects.wordpress.com/2009/11/23/schedule-density/
Member for
21 years 8 months(No subject)
Member for
16 yearsThank you for your answer do
Thank you for your answer do you have any pic of L1 to L4 to consolidate my comprehension, please
Member for
16 years 3 monthsas per the AACE®
as per the AACE® International Recommended Practice No. 37R‐06 here is how they describe the different levels.
The EPC Level 1 schedule summarizes the overall project for client and management. EPC Level 1 schedules show start and finish dates for the major project phases and key milestones (such as design, procurement, construction, and commissioning and start‐up). Significant contract milestones and project‐specific milestones or activities are included in EPC Level 1 schedules as required by the project execution plan.
EPC Level 2 schedules contain more detailed activities for each of the summary phases previously identified in the Level 1 schedule. This often includes a breakout of the various trades or disciplines responsible for the activities in each phase, the critical procurement activities, the major elements of construction, and general commissioning and start‐up requirements. Generally in the EPC Level 2, this is the first level of scheduled detail where logical links or task relationships may be shown.
EPC Level 3 is the first level where the full use of critical path method (CPM) techniques could be shown effectively. In addition to start and finish dates for each grouping of deliverables or activities within each phase of the project, EPC Level 3 schedules include major review and approval dates as well. Most EPC schedule models are not developed below Level 3 in terms of CPM activity detail, with the intent to keep the schedule broad enough to be described for any specific project. EPC schedule levels are normally limited to Levels 1 through 3, however sometimes an “external” schedule data would be prepared and these external schedules are called “Level 4.”
EPC Level 4 are detailed work schedules and generally would be prepared outside of the CPM software, with correlation to the CPM schedule activities and scope of work. The theory is, that if there is too much detail within the CPM network, the schedule would not only lose its flexibility as a value‐added tool to manage the job, but schedule maintenance would become difficult, due to the greater effort needed to maintain the CPM logic after each progress update. A variety of software tools can be employed to develop work schedules at Level 4 and below: spreadsheets, databases, and word processing are all utilized.
Member for
16 yearsThank's a lot I'll read and
Thank's a lot I'll read and write a comments but I think that there is a standard to could speak the same language with our stakholders.
Member for
20 years 6 monthsBryc,At the end of the day,
Bryc,
At the end of the day, this is a subjective assessment that will vary by the project you are involved in, the orgnaisation you are reporting these to, and even the people/stakholders who are using your schedule.
So I would say there is no single answer and it needs to be established by you for your particular requirement, however here are some guidance documents that might help you:
https://planningengineer.net/schedule-levels-level-1-5/
https://www.mosaicprojects.com.au/PDF/Schedule_Levels.pdf this is from Pat Weaver, and is a great reputable source, and another one from Pat also: https://mosaicprojects.wordpress.com/2009/11/23/schedule-density/
The AACE produce two really good recommended practices on this matter, but you need to be a member to access them: 37R-06: Schedule Levels of detail and 27R-03 Schedule Classification System
An older post here on PP itself: http://www.planningplanet.com/wiki/422326/schedule-levels