When Developing Your Study, Which of the Following Timelines Should

When developing your study, which of the following timelines should you employ?

A) develop a baseline of data, collect data at regular intervals using the same instrument
B) collect pre-intervention data, then use different instruments to continue measuring over time
C) use client files as your baseline data, then collect data when needed for reports to funders or accrediting agencies
D) none of the above sufficiently describes a timeline for evaluation