🗂️ The 6 Rs Strategy Board

Drag a card (SortableJS) from the Unclassified pool into a lane. The lane header updates its server count instantly.
📐 Evaluate plan — POST api/six-rs/evaluate with the server count per R. The backend computes cost (per-server rates per strategy), person-days, calendar months given parallel streams, and raises Budget / Time Overrun flags. It also writes the strategy onto all 5,000 server records.
⚡ Auto: Rehost-heavy fills lanes with the industry-typical wave-1 split so you can compare.
🔥 Auto: Refactor everything deliberately shows what happens if you try to modernise all 5,000 servers at once.

Budget ($M) 30 Deadline (months) 18 Team size 25

Lift & Shift · AWS MGN / Azure Migrate · $1.5k/srv

Lift, Tinker & Shift · Oracle → RDS/Azure SQL · $6k/srv

Re-architect · Kubernetes microservices · $25k/srv

Drop & Shop · move to SaaS · $0.9k/srv

Switch off · zombies & EOL · $0.2k/srv

Keep on-prem · mainframe, latency, compliance · $0

Drag all cards into lanes, then Evaluate.

Flow & timeline

Assessdebt × value

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Classifypick an R

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Cost & timemath

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Wavessequence

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Fleet tagged5,000 records

Click a node to learn what it does.

Plot every app on a 2×2: technical debt vs business value.
Rehost the big middle; Replatform databases where a managed service exists; Refactor only the few high-value, high-change apps.
Retire what nobody uses; Repurchase commodity (mail, HR, CRM); Retain what can't move yet.

R	Also called	Typical wave-1 share	Risk	Tooling
Rehost	Lift & Shift	55–70%	Low	AWS MGN, Azure Migrate
Replatform	Lift, Tinker & Shift	10–20%	Medium	DMS, SCT, RDS, Azure SQL
Refactor	Re-architect	5–15%	High	EKS/AKS, CI/CD
Repurchase	Drop & Shop	5–10%	Low	M365, Salesforce, Workday
Retire	Decommission	~10%	Low	Runbooks, CMDB
Retain	Revisit	5–10%	Low	Hybrid connectivity

If the sum of Refactor + Replatform exceeds 30% in wave 1, your plan is probably a modernisation programme wearing a migration badge.

🐍 Python executed on the server (evaluate_six_rs)

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