Hello vvojtek-- and welcome to English Forums. In part it depends on your specific layout and presentation. Generally, I suggest that you use active voice in paragraphs ( I implemented a new IT system, monitored its effectiveness, and reported to the General Manager ) and use the noun forms in listing-- and you will soon discover that you must use the -ing forms when no other form exists: My duties included: - Implementation of a new IT system - Monitoring of its effectiveness - Reporting to the General Manager If almost all of them are -ing forms, then change the other(s) to match: Implementing of a new IT system.
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