Worked on the BHoM/BHoM repository to enhance data integrity by enforcing immutability on the RequirementResults collection. Addressed a bug by replacing a mutable List with a ReadOnlyCollection, updating the constructor to ensure proper initialization and preventing any modification after object creation. This approach strengthened the API contract for downstream consumers, reduced the risk of runtime mutation bugs, and improved thread-safety in multi-threaded environments. The work demonstrated a focus on robust API design and careful use of .NET collections and C# language features, resulting in a more predictable and maintainable software component without introducing new features during the period.