Standard and custom LBB1-3 CT skill checks don't require any attribute, skill, situational, difficulty, timing, or chained DMs. Nor are there 100+ 'standardized' skill checks to reference - which can easily saturate or be completely implausible for a given situation, and worse, open munchkin rule lawyer avenues.![]()
Classic Traveller tells you to apply DMs if you have certain attribute values. But the DMs are no consistant. Referees have to decide if and where a DM is needed for a long of skills and situations. It's do-able. I prefer to drive an automatic instead of a shift though.
LBB1-3 does have about 2 dozen unique skills, with some, but by far not all, having explicit rules with set targets and DMs (largely caveat-ed to avoid rules lawyering) - of which only a few apply per character and are easily listed right on an index card sized character sheet and all can be listed on 1/2 sheet.
Index cards leave no room for character backstory.
To use CT skill checks properly the Ref does need to understand 2d6 and the probabilities... <shrug>
There's not much to know about 2D6 results. It's the target number and effect number that the ref spends time doing. Mongoose Traveller takes care of all that and makes roll 8+ the standard.
For those that like bell curves in their rolls (5D6s), and need to look at probability charts, Traveller 5 is full of them.