Water, Sanitation, and the Behaviour Gap

The authoritative global scorecard, and the source of the "safely managed / basic / limited / unimproved / open defecation" service ladder that structures every WASH target. Start here to see how coverage is defined and measured — and to notice that the ladder counts access to a facility, which is precisely why the use question in later sections keeps escaping the statistics.

A landmark trial that complicated the field's optimism. Building latrines under the Total Sanitation Campaign raised coverage but did not, in this study, significantly reduce diarrhoea or child malnutrition — because coverage did not translate into universal use. The paper is the empirical hinge on which the whole "toilets vs. toilet use" argument turns: health gains require not latrines, but the elimination of open defecation across the community.

The paper that put sanitation at the centre of the stunting debate, arguing that open defecation can account for a large share of the cross-country variation in child height — and specifically the "Asian enigma" of South Asian children being shorter than poorer African children. Read it as the health-economics case for why the density of open defecation, not just its presence, is what damages early growth.

The single most important book on this subject, and the best place to understand why India's open-defecation problem was different in kind. Coffey and Spears argue that non-use is not about poverty or missing toilets but about caste, untouchability and ritual notions of purity and pollution — which make emptying a pit latrine unthinkable for many, and the open field preferable. It reframes sanitation as a problem of social hierarchy wearing an engineering disguise.

The evidence base behind the book. The Sanitation Quality, Use, Access and Trends (SQUAT) survey found that in many rural households with a working latrine, at least one member still defecated in the open by choice. "Revealed preference" is the sharp framing: for a large minority, open defecation was not a constraint to be relieved but a preference to be understood — and no amount of latrine construction addresses a preference.

The district-level companion to the height paper, showing a strong association between the local prevalence of open defecation and childhood stunting across India. Ecological in design — so read it as strong correlation and mechanism, not clean causal proof — but it established the population-density-of-defecation argument that later randomised and quasi-experimental work built on.

A short, accessible entry point if the book is more than you need right now. The interview lays out the core argument in plain language — that a programme which ignores caste and purity will keep building toilets that go unused — and is the fastest way to get students to the counterintuitive claim before they read the harder evidence.

The foundational text of the approach that flipped the model: instead of subsidising latrines, CLTS facilitates a community to confront the reality of open defecation collectively — the "walk of shame", the visceral realisation that "we are eating one another's shit" — and to end it themselves, without hardware subsidies. Hugely influential and hotly debated; read it alongside the critiques of coercion in Section 04, because the same emotional force that drives CLTS can shade into shaming.

The review that established handwashing with soap as one of the most cost-effective health interventions known, capable of cutting diarrhoeal risk by around 40%. It is the "H" in WASH that programmes routinely underfund relative to the "W" and "S", and the evidence base for treating hygiene behaviour, not just infrastructure, as a health intervention in its own right.

The evidence that hygiene behaviour can be shifted without invoking health at all. The SuperAmma campaign used emotional and social motivators — nurture, disgust, status — rather than germ-theory education, and produced large, sustained increases in handwashing. A model for behaviour-centred design, and a rebuke to the assumption that people fail to wash because they don't know they should.

The primary source for the mission's own framing, targets and dashboards. Launched in 2014 with the goal of an open-defecation-free India by 2019, SBM reports the construction of over 100 million rural toilets. Read the official claims first — coverage, ODF-declared villages, verification — precisely so you can hold them against the independent surveys that follow.

The WHO's modelling estimate that the mission would help avert more than 300,000 deaths from diarrhoea and protein-energy malnutrition between 2014 and October 2019. The strongest official statement of SBM's health case — and, as a model built on assumed use rates, exactly the kind of projection the independent measurement work below was designed to test against reality.

The essential independent check on SBM's claims. Revisiting the same four states, the study found open defecation had genuinely fallen — from about 70% to 44% of rural people — real progress the mission deserves credit for. But 44% still defecated in the open despite the ODF declarations, and the survey documented coercion in enforcement. The honest reading: substantial gains and overstated success, in the same data.

For the money and the machinery: independent tracking of what SBM budgeted, spent and reported, district by district. Use it to move past the headline toilet count to the questions that decide whether gains last — financing, incentive structures for officials, and what happens to a village after the ODF banner goes up and the funding cycle moves on.