Abstract
It is NASA Office of Space Science (OSS) policy that International Space Station (ISS) research opportunities will be competed against other platforms and opportunities, i.e., there is no plan to have a set aside for developing ISS payloads. However, future Explorer Program solicitations will allow ISS investigations to compete on an equal basis with other missions requiring expendable launch vehicles, secondary-payload launches, etc. Commitment of Explorer Program resources, on the other hand, requires a three-year limit for instrument development. This means that ISS investigations will not be solicited by OSS until there is confidence that selected instruments can be launched within three years. Now that the ISS assembly is about to begin, the space science community should feel challenged to design instruments that can be built within the cost caps of the specific Explorer Program categories.
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