World over, Thematic Maps are being increasingly used as a decision support tool. For efficient and automated generation of these Maps, without recourse to any special GIS techniques, NIC Madhya Pradesh has developed a general tool viz., Instant Map Preparation Analysis & Customization Tool (IMPACT), which is an easy to use Thematic Map Generation Tool. Any novice can use this tool for generation of Maps as it does not require any expertise. IMPACT has been conceptualized keeping in view the developers as well as the end users (planners, researchers, analyst, administrators etc.) who are interested in the preparation and use of thematic maps. Some of the features of IMPACT include easy-to-use interface for capturing all information related to thematic attributes, online preview of the thematic map generated while entering attributes, Storing of the map in BMP as well as JPEG file format, in-built range checks to improve data consistency etc. IMPACT works on Windows platform and requires inputs in the form of a Scanned Map, Parameter Values on which the Thematic Map is to be generated and thematic attributes. So far, over 200 maps are prepared using the tool and the maps pertaining to departments of Women & Child Development and Public Health Engineering are already hosted on the net.