We shape the work before giving it to a team. A small group called shapers works in parallel to the development teams. They define the key elements of a solution before we consider a project ready to bet on. Projects are defined at the right level of abstraction: concrete enough that the teams know what to do, yet abstract enough that they have room to work out the interesting details themselves.
<aside> ☝ Be sure to be familiar with Shape Up lifecycle - template
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Shaping is a creative process at which we are trying to find a solution to a given problem or a use case. At the beginning of Shaping process, there is an idea we pick at the To Shape - template meeting. Each shaping idea has a responsible person who manages the labor of work, such as researching part, proposing a rough solution, and technical viability. The shaping cycle has four weeks and ends with the Betting table - template.
For more in-depth explanation; read the five chapters in the Shape Up book (30 minutes read).
Read more in the Principles section in which all phases are explained in fine detail.