OOA - Object Oriented Analysis
This is a broad level concept. This is a technique to analyze the functional requirements.
OOAD - Object Oriented Analysis and Design.
Once you analyze the functional requirements based on OOA, you will design your application based on OOAD techniques. So, OOAD is a technique to design the functional requirements. You may say it as a subset of OOA.
OOP(s) - Object Oriented Programming
Once you designed the application using OOAD techniques, you will implement the system. So, OOP is a technique to implement (programming) requirements.
So what you do in Object world is,
OOA -> OOAD -> OOPS
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