The ASES is an computer-based expert system which answers queries on the crop suitability and required farming system technology for a given area. ASES information database consists of location, soil, climate, crop requirements and fertilizer recommendations. Fertility capability interpretations for upland crops and lowland rice are adopted to complement the crop suitability. It also identifies soil management constraints relevant to agriculture. Economic cost and return analysis is also included as one of the ASES’ output.