
eingeleitet
initiated
Describes a process, action, or measure that has been begun or started.
Die sofort eingeleiteten Rettungsmaßnahmen waren erfolgreich.
The rescue measures initiated immediately were successful.
initiated / channeled
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initiated
Describes a process, action, or measure that has been begun or started.
Die sofort eingeleiteten Rettungsmaßnahmen waren erfolgreich.
The rescue measures initiated immediately were successful.

channeled
Describes the deliberate directing of substances, especially liquids or wastewater, into a body of water or into the sewer system.
Das illegal in den Fluss eingeleitete Chemikalienabwasser verursachte ein Fischsterben.
The chemical wastewater illegally channeled into the river caused a fish die-off.
'Eingeleitet' (initiated / channeled) is the past participle of the verb 'einleiten' (to begin, to lead into). It is used like an adjective, usually before a noun, to describe it.
Das eingeleitete Verfahren kann nicht mehr gestoppt werden.
The initiated procedure can no longer be stopped.
The context reveals the meaning: if people are talking about abstract things like 'Maßnahmen' (measures) or 'Verfahren' (procedures), it means 'begonnen' (begun). If they are talking about substances like 'Abwasser' (wastewater), it means 'hineingeführt' (led into).
Die eingeleiteten Schritte zeigten schnell Wirkung.
The initiated steps quickly had an effect.
In the meaning 'begonnen' (begun), 'eingeleitet' often appears with nouns from formal contexts such as government, law, or medicine. Typical examples are 'eingeleitete Maßnahmen' (initiated measures), 'eingeleitete Ermittlungen' (initiated investigations), or 'ein eingeleitetes Verfahren' (an initiated procedure).
Die von der Regierung eingeleiteten Reformen sind umstritten.
The reforms initiated by the government are controversial.
established / introduced
Eingeführt and eingeleitet can both be used with a new measure. Eingeleitet emphasizes that a process or action has been started, while eingeführt brings the new rule or measure into a system and establishes it there. Eingeleitet is more appropriate for the start of something, while eingeführt is more appropriate for implementing a new rule.

Die Schule hat wegen der vielen Beschwerden eine Untersuchung eingeleitet.
The school initiated an investigation because of the many complaints.
Die Schule hat eine neue Regel für die Handynutzung eingeführt.
The school introduced a new rule on mobile phone use.