project characteristics for automated testing

1- suggest what project characteristics are most suitable for automated testing??

2- suggest what project characteristics are most unsuitable for automated testing?

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my answer was :

Test cases to be automated can be selected using the following criterion to increase the automation ROI

High Risk - Business Critical test cases Test cases that are executed repeatedly Test Cases that are very tedious or difficult to perform manually Test Cases which are time consuming

The following category of test cases are not suitable for automation:

Test Cases that are newly designed and not executed manually atleast once Test Cases for which the requirements are changing frequently Test cases which are executed on ad-hoc basis.

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also for the first question i wrote:

• Decide what Test Cases to Automate
• Test Early and Test Often
• Select the Right Automated Testing Tool
• Divide your Automated Testing Efforts
• Create Good, Quality Test Data
• Create Automated Tests that are Resistant to Changes in the UI

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so is it right??

i have search on google for the characteristics, but i didn't found anything about it, also i didn't understand the questions or what to write please help, just explain it to me.