I did a search of the forums but came up with no clear answer. According to the book, you need 10 challenging uses of a Field’s Skills before you can buy ranks in it. This has the side effect of making all Field training time and Trust free. Is this the intention, or is the discount only applied to challenging uses over the minimum of 10?

If you are using the optional rule for “Character Defined Rank Advnacement” then you can do one of two things:

Skills:
For each successful use of a skill, you reduce the training time/trust by 10%. If you succeed with 10 challenging uses, you eliminate the time/trust cost and just pay CDP to advance the skill. If you do not check all 10 boxes, you may still advance, but you will have a reduced cost. After advancing and “using” those boxes for a discount, reset your boxes to start over.

Fields:
You need to use each Skill within the field at least twice and have a total of 10 uses of the combined Skills before you can advance your Field with no time/trust cost. You may still purchase ranks normally with full time/trust costs to represent training by professionals.

One key here, you cannot use a box to get a discount on both the Skill and the Field cost. For example, if you filled 2 boxes in all the Science Skills, you could get ranks in Science for just the cost of CDP. This wipes out the filled boxes and you cannot then still get a 20% discount on time/trust for training the skills individually.

Hope that helps.

KaneSolo