What following items must not be included as part of the portfolio documentation?

The choice that indicates "References and titles" must not be included as part of the portfolio documentation is based on the context of what constitutes the main components of a portfolio. Portfolios typically aim to showcase an individual's skills, experiences, and contributions in a systematic way.

While documentation of activities, supporting materials like newspaper articles and flyers, and specific formats for including materials like brochures are all valuable in providing a comprehensive narrative of one's work and engagement, references and titles may not directly enhance the representation of those activities. Instead, they often serve a more administrative or formal function.

Thus, the inclusion of references and titles might not align with the practical and descriptive elements that portfolios are designed to demonstrate. It's more about providing evidence and context for the skills and experiences rather than formal citations or titles that are not directly linked to the project or portfolio's purpose.