As can be seen from the illustration, the time dimension is "orthogonal" to the dimensions of the framework. All the cells of the framework can change over time. Each stage of a project represents another version of the project framework.
The "to-be" framework can be defined in two general ways: a) as the intended goal or vision for the completion of a project; b) as the actual description of the project at some point in the future. Since project requirements tend to change, the former is more prescriptive but less apt to be realistic; the latter definition is more descriptive and realistic, but it offers no guidance during the project development phase. Therefore, it is probably better to consider the 'to-be' framework as a vision of the best option or alternative for the final project. This vision can become more realistic as it converges on the project completion milestone.