Final answer:
After the receiver receives an encoded message, the next step is decoding, which means interpreting the message. The ability to understand messages from alien species is uncertain due to potential differences in encoding methods or unexpected communication forms.
Step-by-step explanation:
In the communication model, immediately after the receiver receives the encoded message, the process of decoding takes place. Decoding is the interpretation of the message by the receiver into meaningful information. This step is critical as it determines the effectiveness of the communication process. When dealing with a message encoded within a signal, the challenge is to decipher the encoding method to extract the intended information.
Considering messages from a completely alien species prompts several challenges. We may not immediately recognize the message due to potentially unfamiliar encoding methods or mediums used for transmission. It may be necessary to explore new frameworks for interpretation, as alien messages might take a form that's beyond our current understanding or expectations. This requires an open approach to the possibility of entirely new forms of communication.