DISC profiling is a kind of behavioral competency test which explains the person in certain conditions like:
a) how is the person with himself
b) how is he under stress and also how is he in his personal life.
c) what are his traits for the job competency
d) whether he is fit for promotion or not
e) it's helpful in recruitment too.
DISC involves the definition of:
d - dominance
i - influence
s - steadiness
c - compliance
DISC helps us understand the strengths and weaknesses of different traits, thereby enabling us to channel our resources to develop our strengths. It also brings about awareness of the possible weaknesses that we may have so that we can try to improve in those areas.
Though DISC is based on self-assessment (meaning, the subject fills up the information which is translated to the profile), the analysis of the personality is often an eye-opener to the participants. Most of the time, we are so used to behaving in a certain way that only when we stop to think about it do we realize that we indeed behave in that way in that particular situation.
This gives us a chance to decide if such behavior is desirable to us and whether we want to change it. For more info on DISC, log on to [DISC Profiling Instrument](http://www.singaporeteambuilding.com/teambuilding/disc-overview.htm).
On the part of the competency-based mapping with the people on the various designations you have mentioned, there would be some fixed competencies that are a must like team spirit and certain other competencies which should be taken into consideration. It varies at different levels and is different as per the needs of the industry. So, you need to be careful to decide about that as per your industry requirements.