1. False
  2. Burn; Lane and Roberts; Weber; Townsend; The Kendal Project.
  3. True
  4. False
  5. Douglas; The national Child Development Study; Lacey; Gauntlett and Hill; Parker.
  6. Losing some of the original sample during the course of the study.
  7. They can trace developments over a period of time; they allow a detailed picture to be built up; by comparing groups over time we can identify causes.
  8. The weaknesses of each one can be countered by the strength of the other.