Doing multiple things:

“Robin Chase is the founder and CEO of Buzzcar, a peer-to-peer car sharing service. She is co-founder and former CEO of Zipcar,[1] an innovative car sharing service. She also started, a venture combining online carpooling and social networking. She is also founder of Meadow Networks, a transportation consulting firm, and maintains a blog Network Musings on the topics of climate change, transportation, and wireless networks.”

  • Wikipedia

Can you really start multiple things rather than just one? Sometimes you may want to focus on one thing at a time. Other times, you may be ready for the next thing.