Why can disability-related data be challenging to collect and how can you ensure reliable progress data?

Why can disability-related data be challenging to collect and how can you ensure reliable progress data?

• A. Because students always show consistent performance; use a single measurement across time.
• B. Because behavioral and cognitive variability; use multiple measures and consistent data collection procedures.
• C. Because data collection is expensive; avoid multiple measures to save time.
• D. Because teachers forget to record data; rely on memory.

Answer: (B)