Software Development

//Testing strategies, separated clearly

White box tests the internal logic — you design tests to cover every path. Black box tests only inputs and outputs — you ignore how it works inside. Alpha testing is done in-house; beta testing is done by real users outside the company; acceptance testing is the customer deciding whether to accept the delivered system.

//Three kinds of maintenance

Corrective: fixing bugs found after release. Adaptive: changing the software because the environment changed — new hardware, new law, new OS. Perfective: improving performance or adding features that users asked for.

//Waterfall vs iterative

Waterfall goes through the stages once, in order — simple to manage, but a mistake found late is expensive and the customer sees nothing until the end. Iterative builds a working version, gets feedback and repeats — changes are cheaper and the customer is involved throughout, but it is harder to plan and cost.

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