Dips is a program designed for the interactive analysis of orientation based geological data. The program is a tool kit capable of many different applications and is designed both for the novice or occasional user, and for the accomplished user of stereographic projection who wishes to utilize more advanced tools in the analysis of geological data. Dips allows the user to analyse and visualise structural data following the same techniques used in manual stereonets. In addition, many computational features are available, such as statistical contouring of orientation clustering, mean orientation calculation and qualitative and quantitative feature attribute analysis. Dips has been designed for the analysis of features related to the engineering analysis of rock structures, however, the free format of the DIPS data file permits the analysis of any orientation based data.