I also use groups and specializations for skills. I play in modified d20 and I took original 3.5 skills, grouped them and assigned specialization based on class. You can progress up to 4 ranks in a group and that's for basic tasks. Let's take rogue>lockpicking. A warrior or a wizard could spend points in rogue but he can't specialize. He can also try to picklock a simple lock with using rogue but he needs specialization in lockpicking for a more complex device. It would be same with traps.
Another example is that a wizard can spend in athletics up to 4 points but needs a warrior class to specialize. He can use athletics to swim but needs the swimming specialization in order to swim across a very fast river or remain floating while being hit by waves during a storm.
Also, a higher skill specialization gives other benefits as well. Specialization in survival gives warrior a combat bonus in certain terrains or a scouting bonus for rogue types.
Another example is that a wizard can spend in athletics up to 4 points but needs a warrior class to specialize. He can use athletics to swim but needs the swimming specialization in order to swim across a very fast river or remain floating while being hit by waves during a storm.
Also, a higher skill specialization gives other benefits as well. Specialization in survival gives warrior a combat bonus in certain terrains or a scouting bonus for rogue types.
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