The novelty of new business domains demands that internal corporate ventures (ICVs) exhibit an ability to learn over the course of the venture's development. Nonetheless, ICV learning proficiency may be differentially related to venture performance as a function how various aspects of business planning for the venture are initially approached and evolve. Results from the current research indicate that ICV learning proficiency is more positively related to venture performance when the ICV's initial value propositions are unclear and when the ICV's goals do not extensively evolve over the course of the venture's development.