What are some key considerations that could drive organizations to put metrics in place to measure the effectiveness of internal communication initiatives?

Read What Are Business Metrics? and Measuring Communication Effectiveness Across Diverse Backgrounds and Missions. (link below)
address the following questions:

What are some key considerations that could drive organizations to put metrics in place to measure the effectiveness of internal communication initiatives?
How might the metrics be similar or different with an external communications initiative?
Why is the particular business environment organizations operate in an important consideration when implementing metrics?
What Are Business Metrics?
https://www.klipfolio.com/resources/articles/what-are-business-metrics
Measuring Communication Effectiveness Across Diverse Backgrounds and Missions
https://nap.nationalacademies.org/read/21876/chapter/6#25

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