General:
* Determination: This is the most common and general noun for the act of determining something.
* Decision: This is a good option if you're specifically referring to the act of making a choice.
Specific:
* Resolution: This suggests a firm decision to do something.
* Conclusion: This implies a decision reached after careful thought or investigation.
* Assessment: This refers to the process of carefully evaluating something to reach a decision.
* Calculation: This is specific to determining something through mathematical means.
* Analysis: This implies a detailed examination to determine the cause of something.
Other options:
* Finding: This refers to the result of determining something.
* Outcome: This refers to the result of a process, which may include determination.
The best noun to use depends on the specific context and what you want to emphasize.