Originally posted by RainOfSteel:
It takes into account a bonus from high stats, but ignores penalties from low stats.
Low stats are penalized in not having the +1DM applied to their task rolls.
Also, with most low stats, even if the +1DM is attained, it won't help 'em succeed on the task roll.
So, low stats are penalized.
Example--
Jym has STR-4 and no skill to help him shove open a stuck hatch.
The GM determines that forcing the stuck hatch open is a Difficult task.
Jym will have to roll 8+ to succeed on a Difficult task. There is no DM for difficulty (+0DM for Difficult tasks). And, there is not DM for skill, since Jym doesn't have a skill to use.
If Jym rolls 5- on his roll, he'll get the +1DM as a stat bonus, but the best he'll do, if he gets the bonus, is a roll of 6. That' won't cut a Difficult roll of 8+.
On the other hand, his stat bonus would probably help him achieve Very Easy, Easy, and maybe even Average task rolls.
The higher your stat is, the more likely you'll get a stat bonus--the more likely you'll be able to use it on higher difficulty levels.
Even with Medical-4, I'm going to be failing difficult tasks on rolls of 2 or 3. I hope my heart surgery patients (always a difficult task, at the least) don't mind that a large percentage (from the standpoint of how often doctors succeed in the RW) of my previous operations have ended in failure.
This is exactly the type of feedback I'm looking to hear on this, BTW.
But, I'm not so sure that's a bad number.
Follow this line of thought....
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DMs to the medical roll
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First off, I've read Trav rules (I'm thinking of a JTAS article in particular here) where there are bonuses to doctors based on the TL of the medical facility being used to operate in...and for assisting doctors and nurses.
So, in your example, the Medical-4 guy making a Difficult task roll for an operation would be making it without the DMs provided by a hospital and assisting physicians.
This guy is operating in the field (or maybe with limited facilities aboard a ship).
A +1DM or a +2DM would go a long way to making that roll easier.
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Stat bonus
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Also, since you didn't take into accout a +1DM that many doctors (high EDU) would get on the roll. A doctor with a EDU-10 is going to get that bonus 92% of the time.
So, any doctor worth his salt will be rolling that Difficult task (using your example)and failing only only on a result of 2 (which is 3% of the time).
And, that's without any DMs listed above.
Doctors with low EDU probably won't get the stat bonus--but shouldn't these barely educated doctors have a higher chance of failure than a doctor that's studied and degreed in the field?
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Comparison to MT
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Also note that, under the DGP/MT system, a Medical-4 doctor (we'll call him EDU-4, since you didn't include a stat bonus above) will succeed on this example task throw 58% of the time!
Heck, if you through in a +1DM for a EDU-5/6/7/8/9, that doctor would still only make the Difficult roll 72% of the time.
How's that for comparison to reality.
Note that this system is much more forgiving with your example.
Without a Stat bonus, a Medical-4 doctor will make a Difficult operation roll 92% of the time.
Under your example, here, I'd say the 92% chance of success on the operation is a much more desireable comparison to real life than the 72% or the 58% provided under the MT system.
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Non-medical skills
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But, I do see the point you are trying to make. Maybe a better example would be to say something like this--
Frissi is the engineer on a ship, and he's trying to reroute power from one section of the ship to another. The GM rules this is a Difficult task, given the condition of the ship after the battle. Frissi is INT-5 Engineering-4
Frissi will roll 2D for 8+ to accomplish this task.
DM's are +4 for skill.
Frissi rolls a 3.
He gets his stat bonus: +1DM
Then, we add in his skill: +4DM
Frissi makes the roll.
The only way Frissi would miss this roll is if he rolled a 2 on the task, which would still put him at 7 for the task--just one point shy of making the Difficult task.
Given this, I'd say it's a pretty fair system.