The three mental operations of logic are apprehension, judgement, and inference. Apprehension is the simplest act for the mind to execute because it is just forming a general concept of something, free of judgement.
The next step in mental operations of logic happens to be judgement. It involves affirming or denying something about something else. The thing that is affirmed or denied is called the attribute. The thing that is being judged is called the subject. The final step is called inference. This is when conclusions are drawn from two or more previous judgements. This can at times be called reasoning.