If the candidate is applying to a graduate position, then it is not a good idea to apply until at least a year after rejection, regardless of the reason for rejection.If the candidate is applying to an experienced hire position, then the candidate should ask themselves whether they can convincingly demonstrate an improvement in their peformance. Three months is a very short period, so I would be fairly skeptical that someone would improve their communication skills dramatically in that period. However, if there were extenuating circumstances for the poor performance in the first application then re-application may be worthwhile. Suitable extenuating circumstances could be extreme tiredness or illness, both of which typically impair communication skills.If the candidate re-applies, I would recommend that they make an explicit reference to how they have improved their articulation over the past three months. If their excuse for poor performance at the last interview was due to ill-health or tiredness, then they need to convince the recruiter that these issues will not re-occur under normal operating conditions (e.g. when working typical consulting hours).There is an exception to the above advice. If the candidate's first application was to a role requiring very strong communication skills and the second application is to a role that does not require strong communication skills, then the candidate can argue that they have taken on board the feedback and adjusted their goals accordingly.