Participatory development seeks to engage local populations in development projects. Participatory development (PD) has taken a variety of forms since it emerged in the 1970s, when it was introduced as an important part of the "basic needs approach" to development.[1] Most manifestations of PD seek “to give the poor a part in initiatives designed for their benefit” in the hopes that development projects will be more sustainable and successful if local populations are engaged in the development process.[1] PD has become an increasingly accepted method of development practice and is employed by a variety of organizations.[2] It is often presented as an alternative to mainstream “top-down” development.[2] There is some question about the proper definition of PD as it varies depending on the perspective applied. Two perspectives that can define PD are the "Social Movement Perspective" and the "Institutional Perspective":