When you create a new SCP project and you click the OK button you will be asked if you wish to save the SCP project. You should normally save your project so that all its characteristics will be available the next time you open it. The file saved has an extension .scp . By default SCP will read through all the text files in a project and retain a copy of each word an author uses together with the frequency of use of each word. This information is saved in the SCP project file and is used in searching for concordances, displaying word lists, and the statistics. Although SCP allows you to avoid saving the vocabulary, you should allow it to do so until you are more familiar with the operation of this program. Failure to save the vocabulary will render some features of SCP unusable.