
The biggest myth in project management is not that it is only about schedules and budgets. That myth was debunked so long ago it barely warrants a mention.
The real myth is more dangerous: that a good plan delivers an outcome.
It does not.
A plan is the document everyone agrees on before the work starts. Delivery is determined by the thousand decisions that happen when that plan meets reality.
What a Plan Actually Is
A project plan is a structured expression of intent. It represents the best thinking of a group of people, at a specific point in time, about how they expect work to unfold.
The moment work starts, the plan begins diverging from reality. Not because the planning was poor. Because work is complex, environments shift, and the future is not fully knowable in advance.
The plan does not respond to those divergences. People do.
Someone decides what gets prioritised when two workstreams compete for the same resource. Someone decides what gets descoped when the timeline compresses. Someone decides what gets told to the sponsor and what gets managed quietly at team level. Someone decides whether to hold to the original scope or absorb a late change request that no one has formally costed.
These are not project management artefacts. They are leadership decisions. They happen every day, in every programme, at every level, and the cumulative quality of those decisions determines the outcome, not the quality of the plan that preceded them.
What the Data Shows About Plans and Outcomes
McKinsey’s research with Oxford’s Global Projects programme, originally published in 2012 and still McKinsey’s standing figure on its current insights page, based on more than 5,400 IT projects, found that just one in every 200 large IT projects meets all three basic measures of success: on time, on budget, and delivering intended benefits. The same research found that 17 per cent of large IT projects go so badly they threaten the very existence of the company delivering them. Bain’s January 2026 research on reorganisations, based on a survey of nearly 1,000 global executives and employees, found that 88 per cent of company leaders believe their new organisational structure will achieve its goals. Only 36 per cent of the employees actually working inside those structures agree.
These are organisations with project plans. Most of them had quite detailed ones.
The plan was not the variable that determined whether the transformation succeeded. The decisions made inside the transformation were.
McKinsey has been explicit on this, in its analysis of large technology programme management: traditional project management is not built for the complexity of managing a large number of interdependent workstreams. What that observation is really describing is a decision-making capacity problem, not a planning methodology problem.
When multiple workstreams intersect, when dependencies conflict, when assumptions that underpinned the plan prove false, the organisation needs fast, well-informed, appropriately escalated decisions. The project plan cannot make those decisions. A governance structure can enable them, but only if the people inside it are willing and able to act.
The Organisations That Deliver
I have worked across a wide range of organisations and programmes. The ones that consistently deliver are not the ones with the most sophisticated planning tools or the most comprehensive project documentation.
They are the ones with a leadership culture that makes fast, honest decisions when the plan diverges from reality.
That culture has specific characteristics. Issues get escalated without penalty. Status reporting reflects what is actually happening, not what the sponsor wants to hear. Scope changes get properly evaluated and decided, rather than quietly absorbed and then discovered six months later as the reason for a cost overrun.
Decisions about resources, priorities, scope, and timing get made by the right people at the right level, at the point when the decision matters, not deferred until the situation has become a crisis requiring emergency intervention.
This is not about removing the plan. A plan is genuinely useful. It creates shared understanding, allocates resources, sequences work, and provides a baseline against which reality can be measured. All of that matters.
But the plan is the starting point, not the delivery mechanism.
The Governance Gap Nobody Names
Most programme governance is designed to review progress against plan. Status reports, RAG ratings, milestone trackers, action logs. These are retrospective instruments. They tell you where you have been relative to where you intended to be.
They do not, by themselves, generate decisions.
A programme with robust governance can still fail because the governance structure reports on problems without resolving them. The issues log fills up. The risk register grows. The steering committee meetings run to time, and the programme slides, week by week, toward a late and over-budget delivery, or a cancellation that could have been a scope-reduced success.
The missing element is decision velocity, the willingness and authority to make the calls that change the trajectory, rather than the calls that record that the trajectory has changed.
What Good Actually Looks Like
The shift required is not from planning to improvisation. It is from planning-as-delivery to planning-as-baseline.
Build the plan. Use it. Measure against it. But invest as heavily in decision-making culture as in planning rigour. Who has authority to make what decision at what level? How fast can an escalation reach someone with genuine authority? What happens to the person who brings a difficult problem to the steering committee: are they received as someone providing valuable intelligence, or treated as someone who has failed to manage their workstream?
The organisations with the best project outcomes have thought hard about these questions. They are not the ones with the best plans.
They are the ones that can make the right call at 9am on a Tuesday when the plan says one thing and reality says another.
That capacity is the real delivery engine.








