The Organizing Committee (OCICNM-2007) has the pleasure of inviting the National and International Community of Numerical Methods and Applied Mathematics to participate in the 4th International Congress and 2nd National Congress organized by the Mexican Society of Numerical Methods in Engineering and Applied Sciences (SMMNI). The event will take place in the Michoacán University Cultural Center in January, on Wednesday 17, Thursday 18 and Friday 19, 2007.