Theory of planned behaviour by Ajzen; veridical here means truthful. Three factors:

1. What is my attitude to the behaviour?
2. What do others think or I think others think towards my behaviour (normative belief)?
3. How much control I think or I believe I have towards my behaviour or what factors either make it easy or make it difficult for me to conduct my behaviour?

These will determine my intention to actually act my behaviour, and then intention precedes my actual conduct.