IB Design Technology (DT) SL Extended Essay Example

You communicate a worthwhile topic clearly and sustain a coherent line of inquiry from greywater reuse to a site-specific design proposal.

Your research question stays connected to the main investigation, and the final conclusion returns to it directly.

You selected several relevant methods, including an expert interview, a site visit, case-study research, and contextual calculations.

Your research question is still broader than it needs to be, especially in how it uses terms like sustainability and effectiveness.

The method would be stronger if you stated your interview focus, source-selection process, and comparison criteria more explicitly.

Some of the narrowing to the Singapore site happens later in the report rather than being embedded in the original framing.

You show good subject knowledge across greywater treatment, water reuse, membrane processes, disinfection, and centralized wastewater systems.

You use technical vocabulary confidently and usually accurately, which helps the report sound informed and specific.

You connect source material to the proposed design in a way that shows understanding of how the systems work in practice.

Some important claims and numerical inputs are not traceable enough in the report body, which weakens the reliability of your evidence use.

A few technical explanations need more precision, especially where process chemistry or treatment outcomes are described too confidently.

You sometimes rely on source material without enough discussion of bias, transferability, or local applicability.