Methodology
PHASES is our structured methodology for improving industrial OT critical infrastructure across its full lifecycle. Each phase builds on the last—from upfront planning and assessment through high and low level design, implementation, and ongoing optimization — to reduce risk, strengthen reliability, and align your network with the needs of production.
Within every phase, Prescher.com has defined a set of critical tasks that are key to project success. Each task acts as essential input into neighboring tasks in the same phase and across phases. They were identified and organized over the course of hundreds of IT/OT projects — they work.
Together, the six phases and their underlying tasks provide a clear, measurable, repeatable path for modernizing complex critical infrastructure network environments.
Fast Start Project Focus Areas
Planning
C-Level + Directors + Network Engineer Management
- Establish Project Definitions
- Document Risk/Value
- Joint Team(s) Workshops
- Project Execution Kick Off Meeting
- Identify and document existing systems requirements
Health Assessments
Lead Network Engineer App/Service Owners
- Current State Assessment
- Standards and Design Assessment
- Application Flow Assessment
- Enumerate Enterprise IT service
- Lifecycle & Sustainment Constraints Assessment
- IT/OT Digital Security Services Operations Assessment
Architecture HLD
High-Level Network Engineer Management
- Define System Requirements
- Future State Architecture Definition
- Architecture Gap Analysis
- Identify High-Consequence Assets and Processes
- Evaluate Emerging and Proven Technologies
- Evaluate Cybersecurity Architecture and Policy Alignment
- Preliminary Bill of Materials (BoM) and Budgetary Estimation
- RFI / RFP Development and Preliminary BoM
Smart Execution Focus Areas
Specification LLD
Low-Level Full Network Engineering Staff
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Functional & Behavioral Requirements Definition
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Technology & Vendor Evaluation
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High-Consequence Asset & Process Identification
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Cybersecurity Architecture & Policy Alignment
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Operations, Monitoring & Lifecycle Impact Assessment
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Final Bill of Materials & Investment Validation
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Solution Validation & Field Readiness
Support
Sustain
High-Level Network Engineer Management
- Define System Requirements
- Future State Architecture Definition
- Architecture Gap Analysis
- Identify High-Consequence Assets and Processes
- Evaluate Emerging and Proven Technologies
- Evaluate Cybersecurity Architecture and Policy Alignment
- Preliminary Bill of Materials (BoM) and Budgetary Estimation
- RFI / RFP Development and Preliminary BoM
Execute
Deploy
Full Network Engineering Staff
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Construction Program
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Implementation Plan
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Change Management Requirements
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Resource Assignment
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Execute Convergence and Migration Plan
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Knowledge Transfer
Planning
Industrial OT modernization requires a disciplined planning phase to turn broad executive goals into a realistic project scope that fits within your budget. We focus on bridging the gap between operations, engineering, and security, ensuring all stakeholders are aligned before any work begins. This upfront coordination identifies physical constraints and production risks early, allowing you to move initiatives forward without threatening uptime. By defining clear success metrics and operational requirements at the start, we prevent wasted spend on incorrect hardware and the high costs of mid-project rework. Investing time here protects your bottom line by eliminating emergency projects and ensuring that every dollar spent directly supports the reliability of your critical industrial processes.
Health Assessments
The Health Assessment phase provides an objective, fact-based audit of your actual current state OT environment to establish a reliable baseline of network health. Instead of relying on guesswork, we analyze physical connectivity, traffic behavior, and device configurations to expose hidden bottlenecks and security vulnerabilities before they trigger an expensive production stoppage. By identifying these operational risks early, we generate a prioritized, realistic action plan that focuses your limited budget on the most critical issues rather than spreading resources too thin across minor problems. This report delivers the evidence-based documentation you need to defend your infrastructure requests and project timelines to leadership. By providing a clear view of where your network stands today, we ensure your remediation efforts are targeted directly at protecting uptime and maximizing the return on every dollar spent.
Architecture HLD Strategy
The Architecture (High Level Design) phase provides a standards-based network blueprint that secures your industrial OT operations before you commit capital to hardware or services. By defining clear network zones and data flows early, we help you avoid the high costs of rework and prevent stranded investments in incompatible equipment. Our approach balances security, performance, and long-term maintainability, allowing you to scale your infrastructure through manageable, phased upgrades. Instead of following a high-risk, all-at-once replacement model that strains tight budgets, this design gives you a predictable path to modernize your environment according to your specific operational needs and financial constraints. By establishing these technical requirements upfront, you can justify every expense and ensure that new systems integrate correctly with legacy equipment, protecting your uptime and your bottom line throughout the entire modernization process.
Specification Low Level Design
The Specification (Low Level Design) phase is a critical safeguard for your infrastructure budget. It turns high-level architectural concepts into a comprehensive set of vendor-neutral configurations and precise bills of materials before you sign off on major capital purchases. By detailing every device setting, network segment, and security zone in advance, we eliminate the costly mid-project corrections and surprise add-ons that typically inflate vendor invoices. This detailed technical roadmap significantly reduces integration risk, ensuring new equipment works with your existing OT environment the first time. Having these specifications in hand allows you to compare vendor quotes on an apples-to-apples basis and provides the flexibility to phase installations over time as your budget allows. This practical approach ensures that every dollar spent is a directed investment in a stable, secure network that respects your operational constraints and protects your production schedule.
Execute Deploy
During the Execute (Deploy) phase, we translate technical designs into a live operational network while strictly protecting your production uptime and budget. We coordinate closely with your operations teams to schedule and plan low-risk cutovers that fit your maintenance windows. Every device configuration and physical installation step is validated against specific safety and performance goals to ensure the system works correctly the first time. This disciplined approach avoids the high costs of emergency overtime and prevents repeated site visits caused by configuration errors. By executing changes in a controlled, step-by-step manner, we ensure new equipment integrates seamlessly into your environment without causing unexpected downtime or requiring expensive, mid-course corrections. Our priority is to finish the rollout on time and within the original budget, providing you with a stable, high-performance network that meets all industrial requirements from day one.
Support Sustain
Once your infrastructure is live, our Optimization phase protects your initial investment by ensuring your industrial network continues to meet performance demands without costly failures. We focus on active monitoring and configuration tuning to identify and resolve technical issues before they escalate into production outages or require emergency budget requests. This practical approach helps you extend the useful life of your existing assets and plan for future upgrades in smaller, more affordable steps rather than high-risk, large-scale replacements. By maintaining a stable and efficient environment, you build a consistent track record of reliability that demonstrates clear value to plant leadership. Our goal is to keep your operations running smoothly, providing the data needed to justify your long-term operation, administration and maintenance strategy and protect your bottom line.