It is hard to know where to start in discussing measures that are commonly used in CP – there are so many measures for so many issues. Rather, it may be important for people to understand some principles about the choice and use of any measure:
Measures that are commonly used in CP
There are excellent resources that catalogue measures used in, and evaluated for CP. One example is the text by edited by Majnemer (see: https://www.bookdepository.com/Measures-for-Children-with-Developmental-Disability/9781908316455).