Rationale: In a developing country like Bangladesh, proper development of the health sector requires existence of both public and private components of the sector in considerable size and with the highest possible merits of each, and of the private-public mix, wherever feasible, so as to rapidly increase service provision, improve quality of care, raise economic efficiency, and enhance, equality of service utilization. Although the public health sub-sector is overwhelmingly dominant in Bangladesh, the experts argue that the public component is rapidly approaching the limit of expansion. The limit is being set by, inter alia, widening of financing gap, wastage of resource use and inefficiency of management. Hence, rapid development of the private component is needed to cater to the increasing demand for appropriate care. Objectives: The objectives of this paper were to compute the indices of quality of health care provided by the private health facilities in Bangladesh, rank the facilities in order of value of indices, assess the present level of development of the private sub-sector, and identify the major constraints and the required measures for accelerating the pace of its development. Methodology: The paper first devised an appropriate method of assessing quality of care. This involved identification of the major indicators of quality of healthcare, assigning reasonable weights on the indicators, selection of the sub-indicators for each indicators, measurement of values of the sub-indicators, and computation of quality indices. The method was carefully formulated based on an extensive review of literature, opinions of local experts, and direct observations of the operations of private providers. The indicators of the quality considered were: effectiveness, promptness, expert healthcare, acceptability, motivated staff, and economic efficiency. Each indicator comprised a number of sub-indicators. The method was applied to 19 randomly chosen private facilities of Dhaka city and one facility in Singapore was used as the benchmark. The facilities included hospitals, clinics, diagnostic centres, and GPs. Data were collected from managers, providers of care, and patients/ clients. The quality scores computed were used to rank the facilities in each category, and compare with the performance of the benchmark facility. Findings: The findings show that most of the private sector facilities obtain lower than 50 scores and have serious constraints and problems. The major problems of them are: non-existence of regular doctors, non-existence of minimum needed number of modern equipments, lack of provision of training to staff, most of the support staff being seriously under-qualified, very low nurse-doctor ratio, very low amount of time spent by the provider for a patient, etc. The survey also reveals, on the other hand, that at least a few facilities exist in Bangladesh which obtain more than 70 scores, when the score of the benchmark facility is 100. Conclusion: The study suggest that the scope of improvement of performances amply exists for the private providers in Bangladesh. A number of measures have been recommended and it has been argued, using the evidence, that adoption of the measures will rapidly develop the sub-sector.