After your company developed a new interaction method $($Method $2)$ to potentially replace the existing one $($Method $1),$ you conducted a longitudinal study to evaluate the

effectiveness of switching to Method $2.$ The study's findings, represented through a graph that plots actions per task for both interaction methods over ten long sessions and

includes fitted trendlines based on the power law of learning $(T_n=T_1{n}^a),$ aim to guide the decision$-$making process. What conclusion can be drawn from this figure?

The positive value of $a$ in the equation for both methods implies that performance deteriorates with practice, indicating a fundamental flaw in the design of both

interaction methods

The data for neither method aligns with the power law of learning, implying that both methods could benefit from further refinement

Method $2$ requires fewer actions per task, indicating it is more efficient and the company must adopt it

Method $2$ shows improvement in terms of actions per task with extensive practice, which could deter immediate adoption