following on

My favorite word today is "tractable", meaning obedient, flexible, pliable, easily molded, or in some cases, just useful or optimal. Here's an example from a recent Nature piece about science during WWII:
Elegant derivations from first principles — which often proved tractable only when applied to idealized situations — were of little value to the many colleagues who needed to fine-tune electronics components for maximum efficiency.
 It translates to German as "folgsam". A related adjective is "folgend" which is an adjective meaning "following" or "according to" as in "according to plan" (or, in German, "dem Plan folgend").

I also mention here the the German word "Entwickler", or "developer" in English. I only mention it because it's fun to say.