Cook the pasta and rinse with cold water.
Grill the corn and slice the kernels off the cobs.
Combine the avocado, garlic, lime juice, olive oil, cilantro, cumin, salt & pepper in a food processor or blender.
Puree until smooth.
Stir the corn, black beans, tomatoes, radishes, scallions, cilantro and avocado dressing into the pasta.