Further detailed remarks on what you should consider and take into account when you commission
a translation can be found in the documents The Thirty-Nine Steps and Translation - Getting it right (German version Übersetzung - r/keine Glückssache).
These documents have been published by the ITI, the British association of translators and interpreters.
Verstehen und verstanden werden is a similar document available in the German language, published by ADÜ
Nord (Assoziierte Dolmetscher und Übersetzer in Norddeutschland e.V.). To peruse these at your ease, you can download
the documents in PDF format. Just click on the titles.