Earlier quoted context omitted.
What do you mean by "WIP" in this context? Work in progress? If that's the case, what does "WIP limits" mean?
WIP = work in progress. Generally, in process management/improvement texts like on Lean or Theory of Constraints, you want to limit your work in progress to prevent backlogs and problems. I have 100 books I want to read, that's probably an underestimate. I have 10 open right now at home (I cannot read one book straight through most of the time). I will not open another book until I have finished one of those 10. Sinc…
Addendum:
> if I let my list grow larger I'd never finish
I'd never finish any books. As there's always something new to read the task of reading will never be done. But if I start new books without considering the number currently being read, then the odds of getting back to and finishing any other book is pretty low.