Today, public–private partnerships (PPPs) are rising rapidly and becoming a popular answer to almost every complex challenge: from transport and energy to healthcare, education and even prisons.

But what exactly is a PPP? The term feels intuitive, almost self-explanatory – some form of collaboration between government and the private sector – but it is not. Some descriptions focus on outsourcing arrangements; others point to co-investment structures, while some refer to governance models centered on risk-sharing. None of these are inaccurate, but this divergence in understanding is more dangerous than it seems.

The problem is not the lack of a universal definition, but that, as the term has become expansive and ubiquitous, parties are entering into arrangements under that label without a shared understanding of what a partnership is or what it truly entails.

The truth is that partnerships are far more complex than simply two sectors collaborating. In fact, public and private actors have been working together for decades through traditional procurement and contracting models. The World Bank’s Private Participation in Infrastructure (PPI) database records approximately 9,300 projects globally since 1990. So, collaboration alone is nothing new. When that distinction is overlooked, it leads to costly mistakes driven by misaligned expectations that undermine the very purpose of working together.

The complexities around PPPs

A PPP is not just another institutional arrangement. It is a long-term commitment between actors with fundamentally different mandates, incentives, resources and institutional cultures, and that difference makes it a double-edged sword. Managed poorly, it leads to conflict and costly losses in resources, time and effort. Managed well, it unlocks outcomes that neither party could achieve on its own.

3 features that define a PPP

Before committing to one, every party must clearly understand three defining features to truly know what they are signing up for.

1. PPPs are built on a shared understanding of what success looks like

PPPs are working agreements between a government and a nongovernment organization that share an interest in achieving the same outcome, whether driven by public mandate, commercial opportunity or social mission. However, sharing an outcome does not mean sharing the same understanding of what success looks like.

Consider a PPP in public transportation with the goal of delivering “reliable” bus service. At first, this seems straightforward – until one asks what “reliable” actually means. Does it mean buses arrive every five minutes or every ten? Does it mean operating 18 hours a day, or 24? Each of these definitions shapes costs, risk allocation and social outcomes differently depending on where each party sits.

Reaching a shared definition of success is therefore often far more complex than it first appears, as it requires all parties to be willing to negotiate and accept trade-offs. To get there, each party must bring something to the table that ensures every partner has skin in the game, so that when the goal is achieved, all benefit, and when it fails, all share the cost.

The good news is that once a shared definition of success is reached, incentives tend to align naturally, encouraging decisions that prioritize the partnership’s long-term sustainability over short-term individual gains.

2. PPPs operate within the boundaries of each partner

In a PPP, what each actor brings to the table determines whether they are the right partner: their capabilities must be both complementary to those of others and critical to achieving the shared objective. However, contributing the right resources is not enough.

Before entering a PPP, each party must recognize that these resources – whether capital, execution capacity, technical expertise or social legitimacy – do not define the scope within which each actor can operate. Those boundaries are determined by the sector each party represents, and its core ethos is not transferable simply by working together.

This distinction is critical, especially as more non-governmental actors have entered the public problem-solving arena in recent years, creating confusion about whether the role of government can be replaced, particularly when it fails to deliver. In a PPP, a private firm, no matter how much capital it brings, cannot influence public policy or make decisions that belong to elected institutions. Likewise, a government cannot be expected to assume the same market risks as a private actor, nor execute what it neither has the capability nor the expertise to deliver. If these lines are crossed, the PPP risks becoming a threat to accountability and, ultimately, to democracy.

This is what makes PPPs complex arrangements: partners must collaborate deeply enough to co-create and leverage each other's strengths, yet maintain enough clarity and discipline to never overstep.

3. PPPs are executed by people, not institutions

PPPs may be structured between institutions, but they are executed by the individuals behind them, each shaped by their own incentives, pressures, egos, biases and blind spots. For this reason, entering a PPP requires recognizing that these arrangements operate on a deeply human basis.

Successful PPPs, therefore, require more than contractual alignment; they require deliberate management of the working relationship, including clear roles, communication routines and decision-making processes. Understanding how counterparts think, what they value and the constraints they face is key to effective coordination. But this understanding only emerges through structured interaction and repeated engagement.

This is particularly relevant because PPPs are not limited to governments and private companies; they also encompass collaboration with a wide range of non-governmental actors, including philanthropies, nonprofits, private enterprises and academia, and the management required will vary for each case.

Entering a partnership should never be a default decision. PPPs are powerful, but they are not always the right tool. Before committing, each party must ask whether they are truly willing to negotiate and accept trade-offs to reach a shared definition of success; to respect both their own boundaries and those of their partners, regardless of how many resources each brings to the table; and to engage in a relationship that is ultimately human, not just institutional.

When these conditions are met, partnerships can unlock outcomes that no actor could achieve alone. Therefore, the success of a PPP lies not simply in cross-sectoral coordination, but in entering the partnership with a clear understanding of what it is.