Automatic validation of science programs in the Gemini Observing Tool

The key to a successful observing experience at Gemini is a well-prepared science program. The astronomer uses a software application called the Gemini Observing Tool (OT) to fill in the specifics of instrument and telescope configuration during the 2 process. This task involves knowing several details about the Gemini instruments as well as particularities of the telescope and the best way to observe with them. Unfortunately, reviewing these programs can be tedious and error prone. Failure to catch a simple misconfiguration could lead to suboptimal science results or even lost time at the telescope. As part of an effort to make it easier for investigators to define the details of their programs and for the National Gemini Offices and Gemini contact scientists to check and validate them, we have included an automatic program-checking engine in the OT. The Phase 2 Checker continually examines the science program configuration as edits are made, finds significant problems, and reports them to the user along with suggested corrections. Since its introduction in the 2007B semester release of the Observing Tool, this feature has been very well received by the community. This paper describes the software (infrastructure and user interface) that supports the 2 Checker, results of validating new and existing science programs, and future improvements we are currently considering.