Lisa M. Lane:
An SLO is a Student Learning Outcome. Now, before you roll your eyes, be aware that when the History department was given the task of creating SLOs for all our courses years ago, we were given significant latitude. In our wisdom, we decided to make our SLOs skills-based rather than content-based. Instead of saying what content would be covered, what names and dates and events students had to learn, we would base our SLOs on what skills we wanted students to practice as historians.
Love this approach. Personally, I prefer to go a bit broad and overlappy at this high level, because it allows you to have a dialog about shared goals across subjects.