The discussion document(s) are information records of thoughts, comments and expectations. This is where Famous Websites® will examine the 'challenge' in search of an expedient solution. It may be the case the particular need the software is meant to fulfil already has a solution or it's viability is questionable.
In all cases this discussion is meant to establish whether your company should invest in the software or find alternative solutions. If the conclusion is a clear brief to build the next step is appraisal.