My workbook notes for this research point [click on each page to enlarge]:
Part 4 Project 6 Exercise 2 – research point, page 1Part 4 Project 6 Exercise 2 – research point, page 2Part 4 Project 6 Exercise 2 – research point, page 3Part 4 Project 6 Exercise 2 – research point, page 4Part 4 Project 6 Exercise 2 – research point, page 5Part 4 Project 6 Exercise 2 – research point, page 6Part 4 Project 6 Exercise 2 – research point, page 7