This module contains basic functionality that is expected to be used by a wide variety of IMP users. The classes in it should not directly incorporate experimental data and instead should provide basic building blocks for making restraints and manipulating Particle objects. Typical classes are IMP::core::Harmonic, IMP::core::DistancePairScore, IMP::core::VolumeRestraint etc. _Author(s)_: Daniel Russel _License_: [LGPL](http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html) This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. _Publications_: - See main IMP papers list.