Timothy Williamson (Oxford) gives a talk at the MCMP Colloquium titled "Logics as Scientific Theories". Abstract: Logic has far more in common with other branches of science than is usually recognized. One major aim of science is to develop theories that are true, highly general, and maximally informative subject to those constraints. When the generality requirement is made precise in some natural ways, related to Tarski’s account of logical consequence, the resultant theories meet central requirements for logical systems. An appropriate methodology for choosing between different candidate theories has many similarities to the methodology for theory choice in other branches of science. This involves no reduction of logic to psychology, linguistics, or specifically natural science. The talk will be illustrated with examples from modal logic.