How we change what others think, feel, believe and do
When our inner systems (beliefs, attitudes, values, etc.) all support one another and when these are also supported by external evidence, then we have a comfortable state of affairs. The discomfort of cognitive dissonance occurs when things fall out of alignment, which leads us to try to achieve a maximum practical level of consistency in our world.
We also have a very strong need to believe we are being consistent with social norms. When there is conflict between behaviors that are consistent with inner systems and behaviors that are consistent with social norms, the potential threat of social exclusion often sways us towards the latter, even though it may cause significant inner dissonance.
Ways we achieve consistency between conflicting items include:
If you make a promise, you will feel bad if you do not keep it.
Highlight where people are acting inconsistently with beliefs, etc. that support your arguments. Show how what you want is consistent with the other person’s inner systems and social norms.
You will always be inconsistent in some areas. When changing to fit in with the inconsistencies that someone else is pointing out, think about the other, potentially more serious, inconsistencies that you will be opening up.