# Step 2 · Assessments

This step chooses which questionnaires the trial uses and **when** each one is asked.
Every questionnaire comes from a shared library, so you assemble a trial by ticking the
ones you want rather than building forms from scratch.

## The layout

Questionnaires are listed as tickable rows, grouped into three timeline sections:

- **Before treatment**: questionnaires asked at enrolment or baseline (eligibility
  screening, and standard measures such as THI, TFI, IHS).
- **During the trial**: questionnaires tied to the treatment periods or to daily
  activity (start/end of each treatment period, before/after each daily session, or
  every day).
- **End of the trial**: the final questionnaire.

Tick a row to include it. A ticked row is highlighted so you can see the trial's
selection at a glance.

## Setting when a questionnaire is asked

Each row has a **timing** dropdown. The options are context-aware and include:

- Before treatment
- Start of each treatment period
- End of each treatment period
- After each daily session
- Every day
- End of trial

Changing a row's timing moves it into the matching timeline section. You can also drag
rows to reorder them or move them between sections.

:::{note}
Some library questionnaires cannot yet be shown in the participant app. Those rows stay
tickable but carry a **"not in the app yet"** flag, so you always know what will and
will not reach participants.
:::

## Eligibility and blinding

Two rows behave specially:

- **Eligibility screening** is always part of the trial and is shown locked (you cannot
  untick it or change its timing).
- **Blinding** is a simple on/off tick with a fixed timing.

For how questionnaires are scored and delivered to the app, see {doc}`../assessments`.

Next: **{doc}`3-treatment-phases`**.