# ObservationParameters The `ObservationParameters` interface is used to set filter conditions for the `IntermediateResultReceiver`, so that only intermediate results meeting specific conditions will be called back. ```typescript interface ObservationParameters { getObservedResultUnitTypes(): BigInt; setObservedResultUnitTypes(types: BigInt): void; isResultUnitTypeObserved(type: EnumIntermediateResultUnitType): boolean; addObservedTask(taskName): void; removeObservedTask(taskName: string): void; isTaskObserved(ctaskName: string): boolean; } ``` ## getObservedResultUnitTypes Gets the types of intermediate result units that have been observed. ```typescript getObservedResultUnitTypes(): BigInt; ``` **Return value** The observed types of intermediate result units. ## setObservedResultUnitTypes Sets the types of intermediate result units that have been observed. ```typescript setObservedResultUnitTypes(types: BigInt): void; ``` **Parameters** `types`: The observed types of intermediate result units. ## isResultUnitTypeObserved Determines whether the specified result unit type was observed. ```typescript isResultUnitTypeObserved(type: EnumIntermediateResultUnitType): boolean; ``` **Return value** Returns a boolean value indicating whether the specified result unit type was observed. ## addObservedTask Adds observed task name to be notified when relevant results are available. ```typescript addObservedTask(taskName): void; ``` **Parameters** `taskName`: The specified task name. ## removeObservedTask Remove the observed task name so that intermediate results generated by the task are not notified. ```typescript removeObservedTask(taskName: string): void; ``` **Parameters** `taskName`: The specified task name. ## isTaskObserved Determines whether the specified task was observed. ```typescript isTaskObserved(taskName: string): boolean; ``` **Parameters** `taskName`: The specified task name. **Return value** Returns a boolean value indicating whether the specified task was observed.