The Build system And Software Implementation Standard (BASIS) software package documents and implements the standard for project organization, software build, and software implementation and documentation as established at the Section of Biomedical Image Analysis (SBIA), Department of Radiology, University of Pennsylvania (http://www.rad.upenn.edu/sbia/). The BASIS project was started in February 2011. The initial idea was only to provide a project template based on CMake which would standardize the project directory structure as well as the software build. Besides, this project template would allow the developers to concentrate on the actual software rather than on deciding upon the directory structure, the directory names, and the basic CMake configuration. To provide an even more comprehensive basis for the software development at SBIA, the BASIS project goes, however, two steps further.