You are managing the development of a new weather package in an extremely competitive market. You are planning the must-have features of the weather package in detail so that work can begin and the product can be released to the market as early as possible. The future features are unknown at the moment and will depend on what the competitors release. You will plan these features in greater detail later on. As you and your team create the work breakdown structure (WBS), what will you use to indicate the future features?