# Real-world implementation — Scalability, Availability & Reliability

Source: https://www.geekswithgeeks.com/en/scalability/scalability-21

> Apply foundations 5 in Scalability, Availability & Reliability.

## Understand Real-world implementation

In **Scalability, Availability & Reliability**, use foundations 5 to connect the problem, constraints, and measurable outcome before selecting an approach.

## Practise the workflow

Start small, verify one result, and record what the evidence changes.

![A four-stage learning workflow.](assets/figures/scalability/section-5-map.svg) — Figure 5.1 — Understand, act, verify, improve.

## A useful comparison

Think of this as a route plan: each step should lead to a checked destination.

Check your reasoning.

**Quiz:** What should come before choosing an approach?

- [x] A clear goal and constraints.
- [ ] An unverified copy.
- [ ] No measurement.

*Answer:* A clear goal and constraints.. Evidence makes a decision reviewable.