We have implemented a test-bed with agents who collaborate and communicate, potentially with deceptive information. Agents range from benevolent to selfish. They also have differing trustworthiness levels. Deception handling can vary from agents with mood swings about being deceived, to agents who react minimally to being deceived. We show the effects of different trustworthiness values in different scenarios on group performance. Our agents are designed in BDI paradigm and implement a possible-world semantics. Categories and Subject Descriptors