This is the term researchers use to "measure" happiness:

Subjective well-being

Explanation:

When researchers measure "happiness," they often label this term as "subjective well-being." Well-being refers to how satisfied you are with your own life, your moods and your emotions. Because this is a self-evaluation, the measure is considered "subjective." This concept is usually used in conjunction with two high-quality measures: the Satisfaction With Life Scale (SWLS) and the Positive and Negative Affect Schedule (PANAS).

to plan an idea out before

to stay where they were until m sent for