The strategic bucket approach to product development portfolio selection relies on starting with a clear strategy and then choosing projects that fit into that strategy. This approach emphasises ensuring that the selected projects are aligned with the overall strategy and will contribute to achieving the desired outcome.
You can contrast this approach with the bottom-up approach, which starts with individual projects and then tries to fit them into a broader strategy. The advantage of the top-down approach is that it ensures that all projects are aligned with the overall strategy and work towards the same goal. The disadvantage is that it can be more challenging to implement, as it requires a clear understanding of the strategy from the outset.
In summary, the top-down approach to product development portfolio selection is a more disciplined and effective way to ensure that all projects are aligned with the overall strategy. Implementing it can be more difficult, but the benefits often outweigh the difficulties.