+----------------------------------------------------------+
      | Will it ever be necessary to offer any of the following? | 
      | * Reliably transfer data                                 |
      | * Notify the peer of closing/aborting                    |
      | * Preserve data ordering                                 |     
      +----------------------------------------------------------+     
                |                                    |
                |Yes                                 |No
                |(SCTP or TCP                        |(All protocols 
                | can be used.)                      | can be used.)
                V                                    V
+--------------------------------------+ +-----------------------------+
| Is any of the following useful to    | | Is any of the following     |
| the application?                     | | useful to the application?  |
| * Choosing a scheduler to operate    | | * Specify checksum coverage |
|   between connections in a group,    | |   used by the sender        |
|   with the possibility to configure  | | * Specify minimum checksum  |
|   a priority or weight per connection| |   coverage required by the  |
| * Configurable message reliability   | |   receiver                  |
| * Unordered message delivery	       | +-----------------------------+
| * Request not to delay the 	       |         |             |
|   acknowledgement (SACK) of a message|         |Yes          |No
+--------------------------------------+         |             |
          |                |                     |             |
          |Yes             |No                   |             |
          V                |                     V             V
        SCTP is            |                UDP-Lite is    UDP is        
        preferred.         |                preferred.     preferred. 
                           V
+------------------------------------------------------+
| Is any of the following useful to the application?   |
| * Hand over a message to reliably transfer (possibly |
|   multiple times) before connection establishment    |
| * Suggest timeout to the peer                        |
| * Notification of Excessive Retransmissions (early   |
|   warning below abortion threshold)                  |
| * Notification of ICMP error message arrival         |
+------------------------------------------------------+
          |                            |
          |Yes                         |No
          V                            V
    TCP is preferred.             SCTP and TCP           
                                  are equally preferable.