Module 4 – Submit code you can defend and maintain
Choose the next challenge from the evidence
Write a short retrospective: what you can now explain unaided, which mistake you found, and what still needs practice. Pick a next task that tests the weak point. If you struggle with state changes, add lifecycle experiments. If boundaries are difficult, design a new validation table. If your code is hard to explain, simplify a component before adding more features.
Advanced study can include larger reviewed applications, careful package interfaces, and SPARK specifications and proof. These require sustained practice and feedback. Finishing modules marks progress; mastery is demonstrated over time by making sound decisions, finding mistakes, and maintaining software that other people can understand.
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