thank you for your help.
I ended up to model my system of tasks allocation in Arena.
The learning curve can also be modelled here rather easy , the last thing that I cannot do there is to identify what resource performs what task and to model their efficiency accoring to it.
for example, I have 3 types of tasks. they are performed by 3 types of employees; employees are grouped in sets. Efficiency of different employees grows differently depending on a task performed. I cannot make system "to remember" what task what performed by what employee and connect it with their efficiency. What I did ,it's just approximate growth of their efficiency as a group.
hm, i read again my post. perhaps, it's rather difficult to understand what i am asking... It's more easier to understand looking at the model. so if someone is interested, I can just send it
