Alternative, sustainable interventions in support of zinc treatment for childhood diarrhea need to be identified. Within the NGO sector, direct provision of health services is provided, however some NGOs also work closely with the private sector providers. Hypothetically, this avoids unnecessary duplication of effort and enhances the quality of the care provided in the private sector. This study will provide objective evidence of the impact of this approach, using the scale-up of zinc for the treatment of childhood diarrhoea as a test case. The study will be assessing NGO impact among unregulated (unlicensed), rural service providers. Further, this study will serve to assess the value of this model of scaling up activities in the non-state sector with a particular eye toward more generalizable and replicable improvement in quality of care strategies between NGOs and unlicensed private providers. This will be controlled before-after (CBA) study. An equivalent control area will be included in the study. The objective is to document changes in zinc and antibiotic as well as anti-diarrhoeal usage in childhood diarrhea following a scale-up intervention package delivered by a local NGO to local private providers. This will include sensitization, training and follow-up support. Impact will be assessed in terms of changes in zinc coverage and antibiotic use among households in the catchment population served by these providers. The study will be conducted in four unions located in Sreepur Upazila within Gazipur district, located north to Dhaka. Two of the unions, namely Rajabari and Prohladpur comprising 55 villages with 15,530 households and an estimated 76,150 population will serve as intervention area. The other two unions Telihat and Barmi will be taken as control sites. They contain 53 villages with 19,898 households and an estimated 99,000 population. The curative health services in these sites are provided by local drug vendors, village practitioners, traditional healers, and licensed government, private or NGO health service providers. Data will be collected through survey and in-depth interviews. Data will be entered and analyzed using SPSS version 12.0. Absolute counts, proportions, and means with 95% confidence interval will be calculated. These and regression analysis will be done using STATA version 9, cluster survey program, that accounts for potential within cluster homogeneity. Based upon the household surveys, the outcomes that will be calculated are: coverage-the proportion receiving zinc, ORS (zinc and ORS), and antibiotics or antidiarrhoeals and changes in coverage 6 months following the introduction of the intervention package, equity: who is receiving zinc by age, gender and socioeconomic status. For differences in categorical outcomes crude relative risks and 95% confidence intervals will be determined. It is expected that the study will help in increasing zinc coverage for the treatment of children under five years of age and decrease in the use of antibiotics and antidiarrhoeals within the NGO catchment population.