Abstract : We present BOAR, a forest-structured library of predefined Fragmented Objects (FOs) encapsulating commonly used distributed abstractions. We identify three kinds of interaction FO types (channel, sharing, and synchronization), which can be beneficially included in BOAR. A channel FO type encapsulates a remote or group invocation protocol. A sharing FO type encapsulates a sharing mechanisms such as replication or partition. Finally, a synchronization FO type encapsulates a synchronization mechanism. A FO programmer picks-up from BOAR, the FO types implementing the mechanisms which fits best its needs