Factors are you taking into consideration for sustainability

A​‌‍‍‍‌‍‍‌‍‌‌‍‍‍‌‍‌‌‌‍​s you are planning your intervention, what factors are you taking into consideration for sustainability? What are some of the common reasons why projects fail to be main​‌‍‍‍‌‍‍‌‍‌‌‍‍‍‌‍‌‌‌‍​tained? What are some strategies for overcoming these barriers?