Large-scale IT infrastructure projects require an enormous amount of planning, design, configuration and testing to ensure that everything is working correctly and properly transitioned once the work is done. This takes time and resources. Like their software counterparts, IT infrastructure projects are more likely to be successful — more efficient, secure, and reliable — when accompanied by robust estimation and planning processes. In this article for ProjectManagement.com, Larry Putnam, Jr. and Joe Madden identify best practices for applying parametric estimation to IT infrastructure projects.