
Because of this inherent flexibility, users are often presented with diverse, even divergent, choices for solving every type of problem.

The CCP4 (Collaborative Computational Project, Number 4) software suite for macromolecular structure determination by X-ray crystallography groups brings together many programs and libraries that, by means of well established conventions, interoperate effectively without adhering to strict design guidelines. Potterton, Liz Agirre, Jon Ballard, Charles Cowtan, Kevin Dodson, Eleanor Evans, Phil R Jenkins, Huw T Keegan, Ronan Krissinel, Eugene Stevenson, Kyle Lebedev, Andrey McNicholas, Stuart J Nicholls, Robert A Noble, Martin Pannu, Navraj S Roth, Christian Sheldrick, George Skubak, Pavol Turkenburg, Johan Uski, Ville von Delft, Frank Waterman, David Wilson, Keith Winn, Martyn Wojdyr, Marcin

CCP4i2: the new graphical user interface to the CCP4 program suite.
