Final answer:
Willy's behavior is Machiavellian as it is manipulative and deceitful, aimed at gaining personal advantage in the workplace by taking credit for others' work.
Step-by-step explanation:
Willy's behavior of taking credit for others' work when presenting it to management can be described as Machiavellian. Machiavellian behavior in the workplace involves being manipulative, deceitful, and often using cunning strategies to gain personal advantage. This is in contrast to being trustworthy, which implies honesty and integrity, and to soft influence tactics, which would involve friendly interactions that aim to persuade rather than deceive or coerce. Taking credit for the work of others to advance one's own position is certainly not an acceptable way to get more than one deserve.