The paper discusses the development of plasma-facing components (PFCs) for the Spherical Tokamak for Energy Production (STEP) prototype powerplant (SPP), focusing on the innovative design solutions that address extreme heat, particle, and structural loads. The 'Decide & Iterate' methodology is introduced as a key tool to synchronize prioritized decisions within the fast-paced, iterative design process. This methodology involves several decision sets: 1. **Shape and Location**: This set defines the PFC wall shaping, heat load zoning, and limiter positions, considering plasma equilibrium and control definitions. 2. **Integration within the Wider System**: This set addresses how PFCs integrate with the wider system to meet functional requirements, such as fuel self-sufficiency and net power production. 3. ** Technologies, Coolants, and Materials**: This set involves technology choices, coolant selection, and material properties, balancing heat flux handling, neutron shielding, and maintenance considerations. 4. **Coolant and Service Routing**: This set formalizes the impact of PFC design decisions on service pipework, ensuring efficient maintenance and access. The paper highlights specific innovative solutions, such as: - **Helium-cooled discrete and panel limiters** to increase tritium breeding and enable individual limiter replacement. - **Integration of the outboard first wall with the breeding zone** to enhance fuel self-sufficiency and power generation. - **Use of heavy water (D₂O)** in the inboard first wall and divertor PFCs to increase tritium breeding within the outboard breeding zone. The 'Decide & Iterate' methodology has enabled the identification of these solutions while ensuring compliance with plant-level requirements, including safety, net power generation, tritium breeding, and plant availability. The paper concludes by emphasizing the importance of this methodology in managing the complex design challenges of the SPP.The paper discusses the development of plasma-facing components (PFCs) for the Spherical Tokamak for Energy Production (STEP) prototype powerplant (SPP), focusing on the innovative design solutions that address extreme heat, particle, and structural loads. The 'Decide & Iterate' methodology is introduced as a key tool to synchronize prioritized decisions within the fast-paced, iterative design process. This methodology involves several decision sets: 1. **Shape and Location**: This set defines the PFC wall shaping, heat load zoning, and limiter positions, considering plasma equilibrium and control definitions. 2. **Integration within the Wider System**: This set addresses how PFCs integrate with the wider system to meet functional requirements, such as fuel self-sufficiency and net power production. 3. ** Technologies, Coolants, and Materials**: This set involves technology choices, coolant selection, and material properties, balancing heat flux handling, neutron shielding, and maintenance considerations. 4. **Coolant and Service Routing**: This set formalizes the impact of PFC design decisions on service pipework, ensuring efficient maintenance and access. The paper highlights specific innovative solutions, such as: - **Helium-cooled discrete and panel limiters** to increase tritium breeding and enable individual limiter replacement. - **Integration of the outboard first wall with the breeding zone** to enhance fuel self-sufficiency and power generation. - **Use of heavy water (D₂O)** in the inboard first wall and divertor PFCs to increase tritium breeding within the outboard breeding zone. The 'Decide & Iterate' methodology has enabled the identification of these solutions while ensuring compliance with plant-level requirements, including safety, net power generation, tritium breeding, and plant availability. The paper concludes by emphasizing the importance of this methodology in managing the complex design challenges of the SPP.