In the workplace, manipulating employee evaluation systems to favor specific employees or impose unfair penalties is unethical and illegal. Nevertheless, the following are some of the tactics that may be used improperly, which will undermine fairness and trust among employees: 1. **Subjective rating criteria**: Using vague or subjective rating criteria, which allows the evaluator to adjust the rating based on personal preferences or biases. 2. **Selective data presentation**: Showing only the outstanding performance of specific employees, while ignoring or covering up the achievements of other employees, thereby creating the illusion that some employees are better. 3. **Frequently changing evaluation criteria**: Constantly changing evaluation criteria makes it difficult for employees to adapt, causing some employees to no longer meet the standards of excellence under the new standards, while others benefit. 4. **Information asymmetry**: Not informing employees of the specific evaluation criteria or process in advance before the evaluation, resulting in them having no way to prepare. 5. **Fabricating negative feedback**: Artificially creating negative feedback, or exaggerating the mistakes and shortcomings of certain employees, causing them to be unfairly punished. 6. **Exploiting personal connections**: Using personal connections to intervene in the evaluation system, influence the evaluation results, and provide "advantages" to specific employees. 7. **Group evaluation bias**: If the evaluation is conducted in a group, bias or disharmony within the group may affect the fair evaluation of some members. 8. **Opaque feedback mechanism**: The feedback process lacks transparency, which makes it impossible for employees to know the specific reasons for the evaluation and effectively refute or improve it. In order to maintain a fair and transparent workplace environment, companies should establish a sound evaluation system to ensure the fairness and transparency of the evaluation process. Encouraging the openness and communication of the feedback mechanism is an effective way to avoid these improper behaviors.