"stars" are one of the four types of employees based on the degree of organizational commitment and task performance. "stars" are likely respond to negative events with because they have the desire to improve the status quo and the credibility needed to inspire change.

The answer to the blank space is voice. There are four types of employees besides stars, and they are: land mines, not yet gone, and students.  

These employees are classified into the four categories based on two important questions: Is this employee a cultural fit? Is the employee a contributor?  

Stars would fit culturally and be an active contributor, while students are culturally fit but not yet a contributor. Land mines are not culturally fit but are active contributor while not yet gone are both not culturally fit and not active contributor.

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