One road does not fit all

Why interventions must be fit for purpose

Development is built on solutions.

Roads improve access.

Schools improve education.

Health centres improve health.

Credit improves livelihoods.

Training improves productivity.

Social protection reduces poverty.

Every sector possesses interventions that have transformed lives. Every profession develops approaches that have proven their value. Governments learn from success. Development agencies document good practice. Successful projects become models. Models become guidelines. Guidelines become policy.

This is how institutions learn.

It is also how institutions sometimes stop seeing.

The difficulty is not that successful interventions travel.

The difficulty begins when they travel further than the realities that made them successful.

An intervention that is highly effective in one place may be entirely inappropriate somewhere else.

Not because the intervention is flawed.

Not because the people are different.

But because every intervention is designed for a particular reality.

Development succeeds when interventions are fit for purpose.

It struggles when it assumes that one successful solution can simply be transplanted into another reality.

I learnt that lesson from an island district.

The district that could not spend its budget

For several years government allocated substantial resources to improve transport access in one district.

Year after year much of the allocation was returned unspent.

Officials became increasingly frustrated.

How could a district repeatedly fail to spend resources allocated to solve one of its own priority problems?

The explanations came easily.

Weak leadership.

Poor planning.

Limited technical capacity.

Weak administration.

Lack of commitment.

All perfectly reasonable.

All completely wrong.

Nothing in the expenditure reports suggested another explanation.

Nothing in the budget documents questioned the intervention itself.

The assumption was simple.

If access is poor, roads are the solution.

The district simply had to implement them.

When people explained their reality

Eventually a Participatory Poverty Assessment was undertaken.

Rather than relying only on administrative reports, sector statistics and expenditure returns, people were asked to describe how they actually lived.

The conversations changed everything.

Government had recognised the priority correctly.

People struggled to reach schools.

Health facilities were difficult to access.

Markets were distant.

Administrative services were hard to reach.

Poor access was real.

The diagnosis had never been the problem.

The intervention was.

The district was an island district.

People travelled primarily by water.

Boats mattered.

Landing sites mattered.

Ferries mattered.

Channels mattered.

Yet the resources arriving from central government could only be spent on roads.

They could not legally finance boats.

They could not improve landing sites.

They could not strengthen water transport.

The intervention had been designed for another geography.

Later, reflecting on what had happened, a senior government official said something I have never forgotten.

"We got the priority right. We got the solution wrong. One road does not fit all."

At the time, it sounded like an observation about transport.

I later realised it was an observation about development itself.

What actually failed?

Nothing failed in the conventional sense.

The planning process functioned.

The budgeting process functioned.

The procurement system functioned.

Engineering standards were sound.

The institutions performed exactly as they had been designed to perform.

The intervention itself was technically competent.

The problem lay elsewhere.

The intervention was not fit for the reality in which it was expected to work.

That distinction is easy to overlook.

Development often asks whether an intervention has been implemented well.

It asks much less often whether the intervention belongs to the reality it seeks to change.

These are not the same question.

An intervention can be implemented perfectly and still be inappropriate.

Success in implementation does not guarantee relevance.

Technical excellence does not guarantee contextual fitness.

Principles travel. Interventions do not.

This became one of the most important lessons of my career.

Many development principles are universal.

People should have access to education.

People should have access to health services.

Markets should be accessible.

Communities should participate in decisions affecting their lives.

Women and men should enjoy equal opportunities.

These principles do not change.

The interventions through which they are realised almost always do.

Improving access may require roads.

Or ferries.

Or bridges.

Or public transport.

Or digital services.

Or mobile outreach.

The principle remains constant.

The intervention changes.

Responsive development protects the principle while allowing the intervention to respond to reality.

Rigid development quietly reverses the relationship.

The intervention becomes fixed.

Reality is expected to adapt.

When interventions become habits

Every profession develops interventions it understands well.

Transport engineers build roads.

Agricultural specialists improve production systems.

Health professionals build facilities.

Education planners construct classrooms.

Revenue authorities strengthen tax administration.

Social protection specialists design transfer programmes.

There is nothing wrong with this.

Professional expertise matters.

The difficulty begins when familiar interventions gradually become institutional habits.

Not through ideology.

Through repetition.

Roads have worked before.

Roads become the natural response.

Credit has worked before.

Credit becomes the natural response.

Training has worked before.

Training becomes the natural response.

Over time, institutions become increasingly skilled at delivering particular interventions.

They become less skilled at asking whether those interventions still fit the realities before them.

Institutional competence can quietly become institutional blindness.

Development is about context

The island district revealed something that now seems obvious.

Places are different.

Communities are different.

Livelihoods are different.

Ecologies are different.

Institutions are different.

History is different.

Transport in a mountainous district is not transport on an island.

Agriculture in semi-arid regions is not agriculture in high-rainfall areas.

Urban mobility is not rural mobility.

The challenge is not simply recognising diversity.

It is allowing interventions to respond to it.

Context is not an inconvenience to be managed.

It is the condition that gives an intervention its meaning.

Remove the context and the intervention loses its purpose.

What governments gradually learned

Development has, in many ways, learnt this lesson.

Needs assessments became routine.

Participatory planning expanded.

Environmental assessments became mandatory.

Gender analysis entered project design.

Social safeguards were introduced.

Community consultations became standard practice.

Differentiated service delivery became increasingly important.

All these developments emerged from a growing recognition that interventions cannot simply be transferred unchanged from one setting to another.

They must first understand the realities into which they are introduced.

This represented genuine institutional learning.

But learning is rarely complete.

Why responsive development remains difficult

If the lesson is so obvious, why does development continue struggling with it?

Because responsiveness is expensive.

Standardisation is efficient.

Responsive development requires time.

Standardisation accelerates implementation.

Responsive development requires listening.

Standardisation relies on procedures.

Responsive development accepts complexity.

Standardisation simplifies administration.

Budgets prefer standardisation.

Procurement prefers standardisation.

Monitoring systems prefer standardisation.

Large organisations prefer standardisation.

Responsive development asks institutions to become more flexible than their systems naturally encourage.

That tension never disappears.

The challenge is therefore not simply technical.

It is institutional.

Artificial intelligence and fitness for purpose

Artificial intelligence introduces a new dimension to this challenge.

AI is remarkably good at identifying patterns.

It learns from previous interventions.

It detects similarities.

It predicts outcomes.

It recommends actions based on historical experience.

These are extraordinary capabilities.

But responsive development depends upon recognising difference as much as recognising similarity.

If previous projects associated poor access with road construction, AI may become increasingly confident that roads are the appropriate intervention whenever access is limited.

The algorithm is not making an error.

It is faithfully reproducing the intervention logic embedded within its training.

It optimises previous success.

It does not automatically ask whether today's reality differs from yesterday's.

The danger is therefore not artificial intelligence itself.

The danger is allowing historical intervention patterns to become automated without asking whether they remain fit for purpose.

AI can become exceptionally efficient.

Efficiency, however, is not the same thing as responsiveness.

The lesson the island district left behind

Looking back, I no longer see the island district as a transport story.

I see it as one of the clearest lessons development ever taught me.

The priority was correct.

People needed better access.

The institutions functioned.

The intervention was technically sound.

The project design was coherent.

Yet none of that answered the most important question.

Was this intervention fit for the reality it sought to change?

That question has followed me ever since.

In transport.

In gender.

In taxation.

In governance.

In livelihoods.

The sectors changed.

The lesson remained remarkably constant.

Development succeeds not because it discovers universal interventions.

It succeeds because it recognises that every intervention must first belong to the reality it is intended to serve.

One road did not fit that island district.

Neither does one policy fit every institution.

One programme fit every community.

One model fit every society.

Or one algorithm fit every future.

Responsive development begins with a simple act of intellectual humility.

It accepts that similar priorities do not necessarily require identical interventions.

Reality—not institutional habit—should determine what is fit for purpose.