The urban-rural interface has usually been studied from the point of view of cities with different sectoral interests and very little from rural perspectives. Nevertheless, these kinds of areas need to be studied from both points of view and from comprehensive approaches that could reflect their complexity. Thus the work is oriented to make a comparative analysis of two main approaches to dealing with the rural-urban interface in a Latin-American context: one coming from towns and the other from the countryside, where both of them include the sustainable and a territorial perspective of development. The analysis has taken into account economic, social, environmental and political-institutional issues, as well as urban-rural interactions. Results underline some contributions of such approaches to theory and practice of planning and management of these spaces; such as the value of a complex systems view, planning in different spatial scales and time scenarios, the territory as a support of socio-economic and environmental processes and the role of local actors in this transformation. To conclude, rural development has been arising as an emergent field where medium and small size towns play an important role in linking production with local and global markets and enforcing rural-urban relationships in urban systems.

Initiating around the eighties, the academic training of landscape architects in Mexico is quite recent compared with the tradition in Europe and the U.S. Also new, is the development of landscape research conducted mainly by geographers, urban planners and other professionals trained in natural sciences, whose work is primarily oriented to land use management for urban development and conservation of natural resources or cultural heritage purposes. However, the issue of the cultural landscape in Mexico has been little explored and lacks any integrated and multidisciplinary methodology to bring together social, cultural and natural processes for study. Therefore, this work focuses on the presentation of an appropriate methodology to address the issue of the evolving cultural landscape of the Valley of Mexicali. This work has been developed into three stages: characterization, multiple assessment of landscape and integration of strategies for their management. Thus progress will be presented for the characterization of physical units, landscape components through pictures, visual and spatial patterns of landscape that structure the region and its settlements. As a partial result it was found that multi-valued zones visually and spatially exist in the Mexicali Valley, as well as activities that give character and differentiate it from other agricultural areas of Baja California.

Among the problems that cities face are rapid growth and dynamics in the peripheral and suburban areas of medium size towns, characterized by mixtures of residential neighborhoods and squatters' settlements with wide differences between levels of urbanization and public services. There is also an important flow of commuters, loss of productive and conservational lands and management among several municipalities. Thus the objective is to present a methodological proposal to address the rural-urban interface from a sustainability perspective. To achieve this, six issues were considered: migration and socio-demographic changes, economic growth of the city-region, urban mobility and residential change, settlement morphology and functions, use and depletion of resources and urban and environmental management.