text: and make them compatible a Materials Standardization Programme was carried out for the promotion of building systems and techniques, determining what materials were suitable for use in do-it-yourself building, in accordance with regional and local characteristics. Encouragement was given to the use of technologies that reduce building times and costs, that compete with traditional technologies by relying on economies of scale and on an increase in workers' productivity. 252. Various dociaments have been drawn up and disseminated. Outstanding among them are a catalogue of industrialized housing systems, a systematic analysis of the design of pioblic housing in Mexico, the consumption of materials for housing construction, 25 ready-to-use plans of single-family homes and two- and three- floor apartments, prototypes of industrial plants producing materials by vibrocompression and methods for drawing up plans of units producing materials for building. In conjunction with the National Advisory Committee on Building 13 design and building standards were drawn up that significantly reduce costs. Work continued on the updating and introduction of the Integrated Standards System, which makes it possible to standardize design and building criteria with housing bodies and the States and municipalities through State Committees on housing standards and promotion. 253. With a view to extending housing coverage to population strata inadequately provided for, FONHAPO established a line of credit for rural housing that adjusts loan conditions in line with the evolution of guaranteed prices for agricultural products and to the periodicity of rural income. 254. With a view to reducing the taxes involved in the transfer of title, registration of mortgages and authentication by notary of housing of social interest, support is being given to the State authorities and municipalities in revising fiscal regulations and notaries' scale of fees, so that such expenses, which at the moment represent 10% of the final cost of a dewlling, 
analysis: The text discusses initiatives and programs aimed at promoting housing and construction in Mexico, focusing on standardization, cost reduction, and increasing housing coverage. It highlights the importance of adapting building systems and techniques to regional and local characteristics, as well as reducing taxes involved in the transfer of title and registration of mortgages. This suggests that the main focus is on economic development and social welfare, particularly in the context of housing and construction.