What is the "interruption" in an interrupted time series design?

Which tip applies to the aspire test and psat equally

Look back at act iv scene v to read over ophelia's interactions with claudius and gertrude as well as laertes. then, compare her dialogue to hamlet's dialogue and soliloquies previously analyzed in acts i–iv. what is ophelia's state of mind versus hamlet's?

Why is it essential to operationally define the variables in a study?