You measure the success of internal communication on three levels. First reach: how many staff experienced the message live or watched it back afterwards.
The second level is comprehension: ask three short questions in a survey within 48 hours, for example whether the strategy is clear. The third level is behaviour. Measure four to six weeks later whether teams apply the message in work meetings, presentations or daily priorities.
Compare scores with a baseline measurement beforehand. Qualitative signals count too: do core messages come back in conversations and emails.
Live Impact designs internal events with built-in measurement moments, so you know afterwards what landed.