# IBondManager > IBondManager ## Methods ### isCollateralized ```solidity function isCollateralized(address _who) external view returns (bool) ``` Checks whether a given address is properly collateralized and can perform actions within the system. #### Parameters | Name | Type | Description | |---|---|---| | _who | address | Address to check. #### Returns | Name | Type | Description | |---|---|---| | _0 | bool | true if the address is properly collateralized, false otherwise.