This code system http://hl7.org/fhir/uv/sdc/CodeSystem/entryMode defines the following codes:
Code
Display
Definition
sequential
Sequential
Questions are displayed one at a time. Previous questions and submitted answers cannot be viewed or edited.
prior-edit
Prior Edit
Questions are only displayed once prior questions have been answered (or if optional, skipped). Previously answered questions are available for viewing and potentially editing
random
Random
All enabled questions are visible and accessible to the user. They may complete questions in any order.