The paper presents an agent-oriented programming language SLABSp. It provides caste and scenario mechanisms in a coherent way to support the caste-centric methodology of agent-oriented software development. It uses caste as a modular facility to organize agents into castes and to represent their structure and behavior characteristics. SLABSp also uses scenarios to define agents’ behaviors in the context of environment situations. In the paper, the implementation of the language is briefly described. An example of the program is given to illustrate its programming style. Categories and Subject Descriptors D.3.2 [Programming Languages]: Language Classifications—Concurrent, distributed, and parallel languages General Terms Languages Keywords Caste, Scenario, Agent-Oriented Programming