Today almost everyone uses spreadsheets to build models and graphs. However, research shows that about 90% of spreadsheets contain at least one error and that spreadsheet developers are overconfident in their assessment of the correctness of their own work. Errors in spreadsheets have led to financial losses, false declarations, public embarrassment, loss of job, damaged reputation, loss of share value, loss of investors, loss of shareholder confidence, overestimation of revenues, underestimation of costs, naming the wrong candidate as winner and extra audit costs.  In order to help individuals and enterprises avoid those mistakes, Paul Mireault created the Structured Spreadsheet Modelling and Implementation methodology (SSMI). SSMI was developed using proven Information Systems, Computer Science and Software Engineering concepts and has been taught to undergraduate and graduate students as well as executives when he was an  IT Professor at HEC Montreal, one of a few world-class Business Schools holding the AMBA, EQUIS and AACSB International accreditations.  SSMI is a great tool that can be used by both individuals and organizations to create error-free spreadsheets.  This methodology also makes it easier to explain to your colleagues, bosses and clients how your spreadsheet works. Moreover, it is also easier to audit and test for errors, faster to modify in the future and easier to manage in an organizational setting.