Several folks mentioned that this line in the NBC intro is wordy: "Completion does not imply that other processes have completed or even started the operation unless otherwise specified in, or implied by, the description of the operation." I think a good solution here is to borrow from the existing collectives intro (see below). -Adam From p 2, lines 22-24 we have "It does not indicate that other processes in the group have completed or even started the operation (unless otherwise implied by in the description of the operation)." First, drop the extra preposition in this text (typo from original) "implied by in" --> "implied by" Second, borrow this wording for NBC on p 50, lines 7-8. Change: "Completion does not imply that other processes have completed or even started the operation unless otherwise specified in, or implied by, the description of the operation." To: "Completion does not indicate that other processes have completed or even started the operation (unless otherwise implied by the description of the operation.)"