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Reinforcement learning (RL) consists of methods that automatically adjust behaviour based on numerical rewards and penalties. While use of the attributevalue framework is widespread in RL, it has limited expressive power. Logic languages, such as firstorder logic, provide a more expressive framework, and their use in RL has led to the field of relational RL. This thesis develops a system for relational RL based on learning classifier systems (LCS). In brief, the system generates, evolves, and evaluates a population of conditionaction rules, which take the form of definite clauses over firstorder logic. Adopting the LCS approach allows the resulting system to integrate several desirable qualities: modelfree and "tabula rasa" learning; a Markov Decision Process problem model; and importantly, support for variables as a principal mechanism for generalisation. The utility of variables is demonstrated by the system's ability to learn genuinely scalable behaviour behaviour learnt in small environments that translates to arbitrary large versions of the environment without the need for retraining.
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