We present a logical approach to intention change. Inspired by Bratman’s theory, we define intention as the choice to perform a given action at a certain time point in the future. This notion is modeled in a modal logic containing a temporal modality and modal operators for belief and choice. Intention change is then modeled by a specific kind of dynamic operator, that we call ‘local assignment’. This is an operation on the model that changes the truth value of atomic formulae at specific time points. Two particular kinds of intention change are considered in some detail: intention generation and intention reconsideration.