In the context of TOGAF's business scenarios, business capabilities and value streams are typically modeled during the phase of identifying and documenting the desired outcomes. This is because desired outcomes are directly related to what the business intends to achieve, andtherefore, it makes sense to model the capabilities (what the business can do) and the value streams (the series of steps the business undertakes to create value) at this stage. This helps in understanding the required changes or enhancements to business capabilities and processes to achieve those outcomes.