Buttercup and shared ownership of anti-U-boat tactics

A reading from Captain Roberts's book introduces Buttercup as an anti-U-boat attack method developed in coordination with the anti-U-boat school. Rival claims over who originated a tactic can obscure the exchange of ideas between organizations. Related proposals could improve through meetings and joint refinement before each group later claimed authorship. That interpretation makes cooperation part of assessing competing institutional accounts. Raspberry and Pineapple are also named, without an explanation of their manoeuvres.