Here is how I view what skill levels relate to:
Level 0 - player has some idea what or how it works and can make a guess based off their INT stat score as a % role on a simple task.
Level 1-2 - player has been trained and even some practical knowledge in the skill, but mostly has basic understanding and is a biginner in his skill and ability in such skill.
Level 3-4 - player is capable of doing the job of the task on their own in most cases. Still not the best, but they can work alone and accomplish most tasks asked of them or needed. They are not as fast as others, but they still can do the job.
Level 5-6 - Skilled player in the field and quite fast at doing most things, they might even be able to find many good work arrounds and or improve on certain matters and etc
Level 7-8 - Highly skilled in the field and able to tackle any task as needed and are amazing, this would be someone that might be a Doctorate level player works in Alpha and Beta testing research work within the field
Level 9-10 - Leader in the field and does R&D within the field.
So using my example with a character with a Doctorate Level -8 in Robotics:
INT: 10
EDU: 10
Sci skill (Robotics): level-8 (+40%)
doing a Simple task (+15%)
Total: 10 + 10 + 40 + 15 = 75% chance to accomplish a Simple task (looks like they would have a pretty good chance to do the task but still leaves room to fail)
Now I work in IT for Production and DEV/TEST do Beta Testing and R&D...and see folks that fall into the above FAIL TO DO simple things. Now as I said if they fail their roll, they still get to make a Luck Roll which is their score range again to determin if they know they failed and possibly why, helps to set the stage for better roleplaying the situation.
Not everyone can always win or make the roll, there has to be some chance of failure.
