Final answer:
The dimension layer of diversity being addressed when an organization creates employee participation teams with balanced age membership is external diversity, which includes age as a key characteristic.
Step-by-step explanation:
The organization is addressing the dimension layer of diversity known as external diversity. External diversity includes characteristics such as age, race, ethnicity, gender, and other traits that people are born with or acquire that can influence their work experience and performance. When creating employee participation teams that balance membership by age, an organization aims to leverage the diverse perspectives and experiences that people from different age groups can bring to the table. This approach aligns with the concept of managing generational differences where the unique values and expectations of Baby Boomers, Generation X, and Millennials are acknowledged and integrated. By ensuring a diverse age group representation, organizations enhance innovation and teamwork, avoid conformity effects, and improve the overall work of teams.