
die Durchführung
implementation
The realization or execution of a plan, event, or measure.
Die Durchführung des Experiments dauerte mehrere Stunden.
The implementation of the experiment took several hours.
implementation / feedthrough
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implementation
The realization or execution of a plan, event, or measure.
Die Durchführung des Experiments dauerte mehrere Stunden.
The implementation of the experiment took several hours.

feedthrough
A technical device that allows cables, pipes, or lines to be passed through a wall or housing.
Für das Antennenkabel muss eine wasserdichte Durchführung durch das Dach installiert werden.
A watertight feedthrough through the roof must be installed for the antenna cable.
The word consists of 'durch' (through) and 'Führung' (guidance/leading). It describes the 'Hindurch-Führen' (leading through) of a process from beginning to end, or the guiding of something through an obstacle.
Die Durchführung der Reformen war komplizierter als gedacht.
The implementation of the reforms was more complicated than expected.
'Die Durchführung' (implementation/execution) is the noun corresponding to the separable verb 'durchführen' (to carry out). When you carry something out, the result is the 'Durchführung' (implementation).
Wir führen eine Umfrage durch. Die Durchführung dauert etwa eine Woche.
We are conducting a survey. The implementation takes about a week.
This word is often used in formal contexts. Typical combinations are 'die Durchführung eines Plans' (the implementation of a plan), 'einer Studie' (of a study), 'einer Veranstaltung' (of an event), or 'eines Experiments' (of an experiment).
Die Organisation war für die Durchführung des Festivals verantwortlich.
The organization was responsible for the implementation of the festival.
You can recognize the technical meaning from words like 'Kabel' (cable), 'Rohr' (pipe), 'Wand' (wall), or 'wasserdicht' (watertight). In all other cases, the general meaning 'Realisierung' (implementation/realization) is meant.
Der Elektriker bohrte ein Loch für die Kabel-Durchführung.
The electrician drilled a hole for the cable feedthrough.
implementation / conversion
Umsetzung and Durchführung can both refer to putting a plan or project into practice. Umsetzung places more emphasis on transferring an idea or directive into practice, while Durchführung highlights the organized process of carrying out the project. Umsetzung is suitable for the transition to practical application, while Durchführung is more appropriate for the process itself.

Die Durchführung der Veranstaltung verlief trotz des Regens problemlos.
The event was carried out smoothly despite the rain.
Die Umsetzung des neuen Verkehrsplans beginnt im nächsten Monat.
Implementation of the new traffic plan will begin next month.