operability
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operability
The state in which a device, system, or organism is able to perform its intended tasks correctly and reliably.
Vor dem Start des Flugzeugs muss die Funktionsfähigkeit aller Systeme überprüft werden.
Before the aircraft takes off, the operability of all systems must be checked.
The word is built from three parts: 'Funktion' (function) + linking 's' + 'Fähigkeit' (ability). So it literally means 'ability to function.' Recognizing this structure helps you understand many long German nouns.
Nach dem Update war die Funktionsfähigkeit der Software eingeschränkt.
After the update, the operability of the software was limited.
This noun is often combined with certain verbs. Typical ones are: to 'überprüfen' (check), 'sicherstellen' (ensure), 'gewährleisten' (guarantee), 'wiederherstellen' (restore), or 'beeinträchtigen' (impair) the operability.
Ein Techniker soll die Funktionsfähigkeit der Heizung sicherstellen.
A technician is supposed to ensure the operability of the heating system.
'Funktionsfähigkeit' (operability) is a formal and technical word. It is often found in manuals, reports, and official documents, but rarely in everyday spoken language.
Der Bericht bestätigt die volle Funktionsfähigkeit der Anlage.
The report confirms the full operability of the facility.
performance capacity
'Leistungsfähigkeit' and 'Funktionsfähigkeit' can both say that something is able to work well. But 'Leistungsfähigkeit' asks more about strength or capacity: How much can something perform? 'Funktionsfähigkeit' asks more whether something functions properly at all and reliably fulfills its task. With a machine, both can be important: it can be operable but still have only low performance capacity. The words are easy to confuse because they both occur with devices, systems, and also the body. In practical terms: 'Does it work?' fits with 'Funktionsfähigkeit'; 'How much can it do?' fits with 'Leistungsfähigkeit'.
Nach der Reparatur testete der Techniker die Funktionsfähigkeit der Heizung.
After the repair, the technician tested the operability of the heating system.
Die Leistungsfähigkeit des alten Computers reicht für große Programme nicht mehr aus.
The old computer's performance capacity is no longer sufficient for large programs.