Open Plan vs Microsoft Project is primarily a choice between enterprise schedule governance and flexible desktop scheduling. Deltek Open Plan generally fits large, complex programs that need concurrent schedule access, controlled baseline management, advanced resource scheduling and close integration with Deltek Cobra. Microsoft Project often fits proposal teams, smaller program offices and organizations that value accessibility, rapid schedule development and extensive desktop customization.
Either tool can build a logic-driven Integrated Master Schedule (IMS). However, the better choice depends on the contract, program scale, cost-system interface, governance model and skills of the scheduling team. Neither product automatically creates a compliant schedule or Earned Value Management System (EVMS).
Open Plan vs Microsoft Project at a glance
- Best enterprise scheduling environment: Open Plan
- Best for quick adoption and proposal development: Microsoft Project
- Best native integration with Deltek Cobra: Open Plan
- Best for concurrent multi-user schedule maintenance: Open Plan
- Best desktop reporting and individual customization: Microsoft Project
- Best built-in schedule risk analysis: Open Plan
- Best overall choice: The product that matches the program’s contract deliverables, controls architecture and operating procedures
These distinctions describe typical use cases rather than absolute limits. A disciplined Microsoft Project environment can support a substantial IMS. Likewise, Open Plan can support smaller projects, although its enterprise controls may exceed what those teams need.
How the two scheduling environments differ
Deltek Open Plan
Deltek describes Open Plan as enterprise scheduling software for large, complex and compliance-driven programs. Its architecture emphasizes shared schedules, hierarchical rollups, role-based access, baseline control and connections among schedule, cost, risk and change-control systems.
Open Plan also separates major calculations into deliberate processes. For example, schedulers can run time analysis, resource scheduling, progress calculations and risk analysis. Its scheduling documentation states that risk analysis uses Monte Carlo simulation and that resource scheduling considers availability, logic, duration and target dates.
As a result, Open Plan suits organizations that treat the schedule as controlled program data rather than an individual planner’s file. Multiple schedulers can work within a shared environment, while permissions and administration support formal operating controls.
For a deeper product introduction, see this Deltek Open Plan scheduler overview.
Microsoft Project
Microsoft Project desktop provides automatic scheduling, dependencies, deadlines, critical path analysis, resource leveling, custom fields, formulas and reporting. Microsoft’s published desktop feature description also includes task-path analysis, network diagrams, master projects and import or export capabilities.
Project’s familiar grid and Gantt Chart make it efficient for schedule development and analysis. Schedulers can create custom tables, filters, groups, fields and graphical indicators without administering a separate enterprise scheduling database. Therefore, it often works well when one scheduler owns the file or when a small team applies strong file and configuration controls.
However, flexibility creates risk. Manual scheduling, inconsistent options, uncontrolled constraints and ad hoc field usage can produce schedules that look complete but do not calculate as a reliable network. Teams building a formal IMS should standardize settings, use auto-scheduled tasks and establish written status procedures. The Microsoft Project guide for integrated master scheduling explains those controls in more detail.
Detailed comparison for program controls
Schedule development and critical path analysis
Both products support the Critical Path Method (CPM), logical relationships, calendars, milestones, constraints and resource assignments. Both can calculate early and late dates and identify work that drives key completion events.
Microsoft Project provides strong interactive analysis through Task Path, Network Diagram and Gantt Chart views. For example, a scheduler can select a delivery milestone and highlight its driving predecessors. Custom filters and bar styles also make near-critical and negative-float analysis practical. See how to trace a critical path in Microsoft Project for a focused workflow.
Open Plan takes a more process-oriented approach. Its time-analysis engine targets large networks, while shared project structures support rollups and cross-project coordination. Consequently, it often has an advantage when a program divides the IMS among several responsible schedulers or interconnected projects.
Baselines and change control
Microsoft Project can store up to 11 baselines in one project. Microsoft explains that a baseline captures a schedule snapshot for comparison with the current plan. The basic process is covered in Microsoft’s Project desktop guidance.
Those baseline fields are useful, but they do not create governance by themselves. The program must still authorize changes, preserve supporting records and distinguish the approved Performance Measurement Baseline (PMB) from analytical snapshots. A scheduler can overwrite a baseline unless organizational controls prevent it.
Open Plan places greater emphasis on controlled replanning, role-based access and audit history. That model supports environments where baseline changes pass through formal approval and must remain traceable to the cost system. However, software controls still do not replace a documented baseline change process.
Regardless of tool, programs should define who can modify baseline data, when changes become effective and how schedule revisions reconcile with the PMB. For practical guidance, see how to maintain baseline traceability.
EVMS and cost integration
An EVMS scheduling tool holds the baseline and current schedule, supports critical path analysis and provides the timing basis for resource and budget planning. The Department of Energy’s project management lexicon also stresses close integration between the scheduling engine and the cost engine.
Open Plan has a clear advantage when the organization already uses Deltek Cobra. Deltek positions Open Plan as part of an integrated ecosystem with Cobra for cost and earned value, PM Compass for change control, and Acumen for schedule diagnostics and risk analysis. That shared product architecture can reduce interface development and recurring reconciliation.
Microsoft Project can also provide schedule data to an EVMS cost engine, including Cobra. However, the program must design and control the interface. Key considerations include unique identifiers, Work Breakdown Structure (WBS) and Organizational Breakdown Structure (OBS) mappings, control account fields, calendars, status dates and time-phased data rules.
In either case, the schedule application is not the entire EVMS. The management system also includes organization, work authorization, budgeting, accounting, analysis, forecasting and change control. The article on Deltek Cobra and the Integrated Master Schedule explains the schedule-cost relationship.
Resource scheduling
Both tools can identify overallocations and adjust work based on resource availability. Microsoft Project supports work, material and generic resources, along with automatic resource leveling. Its Resource Sheet, Resource Usage and Team Planner views help schedulers analyze assignments.
Open Plan offers a broader enterprise resource-scheduling model. It can use shared resource files, hierarchical Resource Breakdown Structures and resource-limited or time-limited calculations across projects. Open Plan can also model alternate resources, activity splitting and resource priorities.
Still, automatic leveling requires caution in either product. A calculation can resolve an overallocation while moving activities away from the program team’s intended execution sequence. Before accepting leveled dates, the scheduler should review changed driving paths, float, activity splits and contractual milestones.
Schedule risk analysis
Open Plan includes Monte Carlo schedule risk analysis. Schedulers can assign duration uncertainty and evaluate the resulting distribution of project dates. Therefore, Open Plan can perform basic quantitative Schedule Risk Analysis (SRA) without relying entirely on a separate application.
Microsoft’s published Project desktop feature list does not identify native Monte Carlo schedule risk analysis. Microsoft Project teams usually use a specialized add-in or export the schedule to a separate risk tool. That arrangement can work well, but the team must validate calendars, logic, uncertainty inputs and calculated results after transfer.
Reporting and customization
Microsoft Project is especially effective for individual analysis. Custom fields, formulas, graphical indicators, filters and groups let schedulers build targeted views quickly. For example, a planner can create fields for control account, Integrated Product Team, rolling-wave status and customer reporting category.
Open Plan also supports configurable fields, codes, views and reporting. However, organizations commonly administer those elements as part of a standard enterprise configuration. That governance improves consistency across programs, although local changes may require more coordination.
Which tool is better for proposal scheduling?
Microsoft Project is often the practical choice for a proposal schedule. Proposal teams usually need to develop a credible network quickly, revise it during color-team reviews and produce readable graphics for the technical volume. In addition, many contributors can review an exported PDF or discuss a familiar Gantt Chart without Open Plan training.
Open Plan becomes more attractive when the bidder already uses it as the production scheduling standard. Building the proposal schedule in the intended execution environment can reduce post-award conversion. It also allows the team to apply established codes, calendars, resource structures and cost-system mappings earlier.
First, follow the solicitation. Official Army source-selection guidance, for example, directs evaluators to screen submissions against the electronic media and formats specified in the Request for Proposals (RFP). Therefore, a proposal manager should never assume that either an .mpp file or an Open Plan export will satisfy the submission requirement.
Which tool is better for an executing DoD program?
Open Plan usually has the stronger case when the program has several schedulers, a large integrated network, formal baseline permissions and a Deltek-centered controls architecture. Its shared environment and native Cobra integration align well with governed program controls.
Microsoft Project remains a valid option when the contract accepts it and the organization has disciplined procedures. It can support detailed logic, resource assignments, baselines, critical path analysis and customer reporting. Success depends more on configuration and process consistency than on the software logo.
Neither the Federal Acquisition Regulation (FAR) nor the Defense Federal Acquisition Regulation Supplement (DFARS) should be treated as a universal mandate for one of these products. A specific solicitation, contract, Contract Data Requirements List (CDRL), Data Item Description (DID) or customer instruction may prescribe the required submission format. Requirements can also vary by agency and program tailoring.
Fictional program example
Consider Falcon Ridge, a fictional radar modernization program with 18,000 activities, four major subcontractors and three scheduler workstreams. The contractor uses Cobra for earned value and requires formal approval before anyone changes baseline dates.
Open Plan would likely provide the better operating environment. Multiple schedulers could maintain shared schedule data, while the program could govern baseline access and integrate schedule updates with Cobra. Built-in resource and risk calculations would also support recovery planning.
Now consider the Falcon Ridge proposal six months earlier. One proposal scheduler owns a 1,200-activity plan, and the team must revise it daily as the technical approach changes. Microsoft Project may be faster at that stage because the scheduler can develop logic, create custom views and produce proposal graphics with less administration.
The program could use different tools during the two phases. However, it should plan the transition before award. Otherwise, conversion errors may alter activity identifiers, calendars, constraints, relationships, resource assignments or baseline dates.
Common tool-selection mistakes
- Selecting software based only on familiarity. User preference matters, but the cost-system interface and customer deliverables matter more.
- Assuming built-in checks prove compliance. A schedule-health check identifies conditions. It does not determine contractual acceptability or explain whether an exception is justified.
- Confusing a saved baseline with change control. Baseline fields preserve data, while change control authorizes and documents revisions.
- Converting schedules without reconciliation. Always compare activity counts, relationships, dates, float, calendars, constraints, resources and milestones before accepting a converted file.
- Ignoring the status process. The tool cannot compensate for inconsistent actual dates, remaining durations, out-of-sequence progress or an unclear status date.
- Buying enterprise capability without supporting it. Open Plan requires administration, configuration and trained users to realize its governance advantages.
- Allowing unrestricted flexibility in Microsoft Project. Standard settings, templates, fields and quality checks are essential when several programs submit schedules to the same customer.
Practical selection criteria
Choose Deltek Open Plan when most of the following conditions apply:
- The IMS contains several interconnected projects or scheduler workstreams.
- Multiple users need controlled, concurrent access.
- The organization uses Cobra, PM Compass or other Deltek program-controls products.
- Formal baseline permissions and audit history are central requirements.
- The team needs advanced resource scheduling or built-in Monte Carlo risk analysis.
- The organization can support product administration and specialized training.
Choose Microsoft Project when most of these conditions apply:
- One scheduler or a small team maintains the plan.
- Rapid schedule development and presentation are priorities.
- The project needs extensive desktop views, filters, formulas and reports.
- The organization already has strong Microsoft Project skills and procedures.
- The schedule will support a proposal, internal project or moderately sized IMS.
- External applications can handle cost integration, schedule diagnostics or quantitative risk analysis.
Final assessment
Open Plan is generally the stronger enterprise program-controls platform. Microsoft Project is generally the more accessible and flexible desktop scheduler. However, neither is automatically the correct choice for every DoD program, proposal or EVMS implementation.
Start with the required deliverables and controls architecture. Next, evaluate schedule size, concurrent access, Cobra integration, risk analysis, administration and staff capability. Finally, test the complete monthly cycle before committing: status the schedule, calculate dates, transfer cost-system data, run health checks, process a baseline change and produce the customer deliverable.
The best scheduling tool is the one that preserves logic, baseline traceability and cost-schedule integration throughout execution without making the operating process harder than the program can sustain.