Stop Compressing Time. Start Managing Value.
Efficiently compressing the wrong activity… is still a bad decision.
Reading an excellent post written by Jan van den Berg — a prolific voice in the field we are passionate about, project planning, and a strong practitioner of Primavera P6 — I truly value and share the analysis he presents.
It brings forward something that should already be standard in project management yet still needs stronger presence in daily practice: decisions driven by facts and data.
DRAG is a powerful indicator because it changes the nature of the conversation. We stop asking which activity is the longest and start asking which one is actually constraining project outcomes. The schedule is no longer seen as a simple timeline, but as a system of constraints with real economic consequences.
From a deterministic perspective, DRAG represents the amount of time an activity is effectively limiting the project completion date — essentially, the portion of the project that could be shortened if that activity were reduced.
At that point, schedule compression stops being an exercise in reducing durations and becomes an exercise in value maximization. However, to fully unlock the potential of this approach, the probabilistic dimension must be introduced.
This is where the Criticality Index becomes essential. This indicator, already built into the simulation engine of Spider Project Team , identifies how frequently an activity appears on the critical path across multiple uncertainty scenarios, directly strengthening the SDPM framework.
It is no longer just about whether an activity is critical today in a deterministic schedule, but about how likely it is to control the project finish date when variability in durations, resources, and conditions is considered.
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We now have:
This transforms how schedule compression is approached.
Activities are no longer prioritized based solely on duration, but on expected impact under uncertainty. Actions move from tactical reactions to strategic resource allocation. Time is no longer managed in isolation, but as part of the project’s economic exposure.
This is where planning evolves into decision science.
The schedule is no longer just a planning artifact. It becomes a model of constraints, probabilities, and value — capable of guiding investment, risk response, and executive decision-making.
Technical note: The pDRAG indicator should be understood as a measure of expected impact under uncertainty. It is not a pure probability metric and does not replace a full probabilistic schedule analysis. Its validity depends on the Criticality Index being derived from robust simulations and on the deterministic model being properly structured.
Conceptually, pDRAG combines:
From a decision-theory perspective, this is equivalent to estimating the expected impact of an activity on project duration.
It should therefore be used as a prioritization indicator under uncertainty — not as a substitute for risk analysis, but as a bridge between the deterministic world of CPM and the probabilistic world of Monte Carlo.
