June 3, 2024

The Schedule Basis Memorandum: Types of Information to Include in the Document

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This is the second blog post in a six-part series about the schedule basis memorandum. This post identifies project information to include in the document.

Information to Include in a Schedule Basis Memorandum

Two AACE International publications provide valuable input regarding the general topics to be included in a schedule basis document.1 Consistent with these publications, the major subject headings for a schedule basis memorandum should include an introduction, an overall executive summary, a discussion of the current project status, a basis of schedule assumptions for the major phases or areas of the work, and an assessment of schedule risks. Table 1 provides a summary sample Table of Contents with typical section headings for a schedule basis memorandum.

Table 1
Summary Sample Table of Contents for a Schedule Basis Memorandum

Section NumberSection Title
1.0INTRODUCTION
2.0EXECUTIVE SUMMARY
3.0CURRENT PROJECT STATUS
4.0BASIS OF SCHEDULE
5.0RISK ANALYSIS
6.0SUPPORTING APPENDICES, ATTACHMENTS, AND EXHIBITS

The detail and depth of discussion for each of the above sections depends on the size and scope of the project. For example, a small-scope project with a short, planned duration may not require a detailed schedule basis discussion. Moreover, if the contractor is developing a baseline schedule, not much discussion may be necessary for Section 3, Current Project Status, when the project has not recorded any progress. In contrast, large and complex EPC projects usually require a more in depth schedule basis document that provides substantially more detailed explanations and discussions. Table 2 presents an expanded sample Table of Contents for potential topics to include in a more detailed schedule basis memorandum.

Table 2
Expanded Sample Table of Contents for a Detailed Schedule Basis Memorandum

Section NumberSection Title
1.0INTRODUCTION
2.0EXECUTIVE SUMMARY
2.1Purpose of Document
2.2Overall Schedule Information
2.3Analysis of the Critical and Near-Critical Paths
2.4Analysis of Risks
2.5Key Assumptions, Allowances, and Exclusions
3.0CURRENT PROJECT STATUS
3.1Permitting Status
3.2Engineering Status (Current and Forecasted Quantities)
3.3Procurement Status
3.4Module Fabrication Status
3.5Transportation Status
3.6Custom Clearance Status
3.7Construction Status
3.8Turnover Status
3.9Commissioning and Startup Status
3.10Interface Status
3.11Change Order Status
3.12Risk Register Status
4.0BASIS OF SCHEDULE
4.1General Issues
4.1.1Owner Reviews and Approvals
4.1.2Basis of Durations
4.1.3Use of Constraints
4.1.4Float Utilization (i.e., Early Dates versus Late Dates)
4.1.5Schedule Calculation Mode (i.e., Retained Logic versus Progress Override)
4.1.6Roll Up of Detail
4.1.7Resource Loading and Equipment Utilization
4.2Engineering Basis
4.2.1Assumptions and Allowances
4.2.2Exclusions
4.3Procurement Basis
4.3.1Long Lead Items
4.3.2Assumptions and Allowances
4.3.3Exclusions
4.4Module Fabrication Basis
4.4.1In-Country Module Program
4.4.2Out-of-Country Module Program
4.4.3Assumptions and Allowances
4.4.4Exclusions
4.5Transportation Basis
4.5.1Bulk Materials and Equipment
4.5.2Module Transportation
4.5.3Custom Clearance
4.5.4Assumptions and Allowances
4.5.5Exclusions
4.6Construction Basis
4.6.1Productivity Analysis
4.6.2Camp Facilities and Bed Space Analysis
4.6.3Heavy Lifts
4.6.4Scaffolding
4.6.5Assumptions and Allowances
4.6.6Exclusions
4.7Project Calendars
4.7.1Work Calendars
4.7.2Holidays
4.7.3Inclement Weather Calendars
4.7.4Assumptions and Allowances
4.7.5Exclusions
4.8Duration Contingencies
4.8.1Assumptions and Allowances
4.8.2Exclusions
4.9Change Order Impacts
4.9.1Approach and Methodology
4.9.2Assumptions and Allowances
4.9.3Exclusions
4.10Concerns and Other Issues
5.0RISK ANALYSIS
5.1Approach and Methodology
5.1.1Qualitative Risk Assessment
5.1.2Quantitative Risk Assessment (i.e., Duration Uncertainty and Risk Events)
5.2Analysis Results and Comparisons (i.e., Deterministic, P50, P70 & P90)
5.3Assumptions and Allowances
5.4Exclusions
6.0SUPPORTING APPENDICES, ATTACHMENTS AND EXHIBITS

In general, more detail is better when documenting the schedule basis for large and complex EPC projects. Even if no discussion is needed for a particular sub-section, an added benefit of the expanded Table of Contents is that it also serves as a check list for the contractor and owner to further ensure that all relevant topics have been addressed, when applicable. It also serves as a reminder to evaluate these topics as to whether the schedule basis document needs updating during project execution.


1    AACE International’s PS.18, Scheduling Management:  Schedule Basis Memorandum, by H. Lance Stephenson, CCC, 2007 AACE International Transactions; and AACE International’s Recommended Practice 38R-06, Documenting the Schedule Basis, June 18, 2009.

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