Introduction is a quantum chemistry software developed by scientists to be used by scientists.
Molcas is a research product and it is used as a platform by the Lund quantum chemistry group in their work to develop new and better computational tools in quantum chemistry. Most of the codes in the software are newly developed and the user should not be surprised if he finds a bug now and then. The basic philosophy behind Molcas is to develop methods that will allow an accurate ab initio treatment of very general electronic structure problems for molecular systems in both ground and excited states. This is not an easy task. Such codes are today standard in most quantum chemistry program systems.