DESCRIBES PROCEDURES USED TO DEVELOP A SYSTEM OF MATRICES DEALING WITH WATER AND WASTEWATER TREATMENT PROCESSES AND IN-COUNTRY RESOURCES IN ORDER TO IDENTIFY OPTIMAL TREATMENT PROCESSES IN TERMS OF A COUNTRY'S RESOURCES. TO TEST THE SOUNDNESS OF ITS CONCEPTUAL APPROACH, THE PROJECT INCLUDED A GLOBAL STUDY OF 20 SITES REPRESENTATIVE OF APPROPRIATE TREATMENT PROCESSES. THE CONCERN OF THE DIRECTORS AT THE DATE OF THIS REPORT, HAVING DEVELOPED AND TESTED THE METHODOLOGY, POINTED TO DEVELOPING ACCEPTANCE OF THE MOST APPROPRIATE TREATMENT TECHNOLOGY BY THE LESS DEVELOPED COUNTRIES. THE UNIQUENESS OF THE PROJECT -- BRINGING PROCESS AND RESOURCE TOGETHER -- INTERESTED NUMEROUS GROUPS, NOTABLY THE UNITED NATIONS ENVIRONMENT PROGRAM, WORLD HEALTH ORGANIZATION, AND CLUB OF ROME.