Job Description vs Actual Job

I reluctantly write this post here since I'm not sure who actually reads this blog and how it will be taken. I roughly know who reads the Lauren and Nick Blog, but I'm not totally sure who reads this one. I know it is published via my Plaxo Pluse and I think I have it imported into my Facebook Notes, but I'm not sure nor am I sure if I have it being published anywhere else...

Anyways, this topic came up among friends last night. As the post title states, the wonder is what others think about there Job Description as compared to what they actually 'do'. More importantly performing the role of a manager when it is not in your job description.

Basically when you think about it we are 'only' paid to do what is stated in our job descriptions. So what do you do when you find yourself doing other work. I'm not saying that you find yourself doing the work of others, but that your work has out grown your job description. Say you were hired as a junior level engineer, but over time while your position has not change, you now find yourself managing a small project. Or say you are a entry level financial analyst but find yourself doing the same work as your superiors. Or even say your job description includes the work of a upper level manager but you title only lists you as a junior level manager.... anyways these are all very common possibilities... so what should you do?

do you:

1. Accept it and keep going
2. or Accept it and seek redefinition of your job description
3. or Accept it and simply seek compensation (raise, bonus, etc)
4. or Reject it and simply not do it

All very plausible options but which should you take. Now there are also other factors:

1. Do you want the work?
2. Are you seeking advancement or raises?
3. Do you feel you are not capable of the doing the work (not likely if you are already doing it)

Regardless of the motive, desire of personal choice, I guess the bottom line question is, do you do it or not? This means until our job description matches our job, or do we wait till our job description changes and then start the work? So what does everyone else out there think?