Simulate activity of users?

Hello,

I've got a web application that should simulate different activities as follows:

- User1 and User2 teamed up for an activity called Activity1. - Users have skills: skill1, skill2

def simulate_activity   a = Activity.find(params[:id])   return execute_1 a if a.activity_type == "1"   return execute_2 a if a.activity_type == "2" end

def execute_1 act   report = ""   if(calculate_chance(user1.skill1) && calculate_chance(user2.skill1)     report += "Users successully blah"     act.status = "succeeded"   else     report += "Users did not manage to blah"     act.status = "failed"   end   report end

def execute_2 act   report = ""   if(calculate_chance(user1.skill2) && calculate_chance(user2.skill2)     report += "Users successully blah"     act.status = "succeeded"   else     report += "Users did not manage to blah"     act.status = "failed"   end   report end

I hope you get what I mean. My only problem is that I don't really like the way it's programmed above. Does anyone know a better way to "simulate" these kind of activities so it's no mess when it gets more complex etc.?

No one?

If no one knows how to do it better does what would you guys suggest where to put these? Into the model of reports or seperate library/module?