... which is weakest among those with the greatest health needs The poorest will be least able to wield social power. Understanding their health needs depends more on the strength of public health information and planning systems, on the 'voice' given by more organized civil society initiatives or, as groups become more marginal, on specific targeted research.   4. INTRODUCTION Enhancing civil society Priority health problems Facilitating roles Interactive exercise Policy accountability Partnerships Equity in health Responding to communities The potential for success Interactive exercise