As an AI language model, I assume you are referring to clinical trials. The characteristics of the trial phase in clinical trials are:

1. Goal-oriented: The trial phase of a clinical trial is designed to achieve a specific goal or objectives.

2. Controlled environment: Clinical trials are conducted in a controlled environment to minimize the impact of external factors on the results of the study.

3. Testing of hypothesis: The trial phase is focused on testing a hypothesis or a research question to determine the effectiveness and safety of a new treatment or intervention.

4. Randomization: Clinical trials use randomization to assign participants to different treatment groups to ensure that the results are not biased.

5. Blinding: Clinical trials use blinding to prevent bias from influencing the results of the study.

6. Large sample size: The trial phase of a clinical trial typically involves a large sample size to ensure that the results are statistically significant.

7. Ethical considerations: Clinical trials must adhere to ethical guidelines to ensure that the rights and welfare of participants are protected.

8. Data collection: Data is collected throughout the trial phase to evaluate the efficacy and safety of the treatment or intervention being tested.

9. Analysis: The data collected during the trial phase is analyzed to determine whether the treatment or intervention is effective and safe.

10. Regulatory approval: The trial phase of a clinical trial is a necessary step in obtaining regulatory approval for a new treatment or intervention.