After final definition of the solution from the four different perspectives, you should provide the following:
Detailed architecture capabilities
Different alternatives
Selection criteria
Best-fit selection per your criteria
Discussing alternatives to the proposed solutions, for the enterprise architecture.
At this stage, We can have different opportunities to provide per each area, which the power of the enterprise architect, as he act as the consultant to provide and confirm the optimum solution that fit with organization objectives.
Per Business Architecture:
Make or buy strategy (software/component/Platform/Cloud/HW)
Best fit Marketing Strategy
Process improvement
Per Data Architecture
Best-fit data architecture model (Relational/Non-Relational)
Best-Fit analytics tools
Per Application Architecture
Best-Fit standards (CMMI/SAFe)
Best-Fit Software engineering tool
Best-Fit approaches (API first/Micro-Services)
Best-Fit technology Stack (.Net/Java/Python)
Best-Fit Data Analysis Tool
Per Technology Architecture
Infrastructure (Primary and DR)
Security Model
Network Model
Generally:
Architecture principles
Supportive policies
Enterprise Architect
Archimate
Dr. Ghoniem Lawaty
Tech Evangelist