What should be prioritized when analyzing individual email campaigns for effectiveness?

When analyzing individual email campaigns for effectiveness, prioritizing individual email metrics and return on investment (ROI) provides a comprehensive view of the campaign's performance. Focusing on individual email metrics, such as open rates, click-through rates, and conversion rates, allows marketers to assess how well the email resonated with its audience. Additionally, considering ROI enables marketers to evaluate the financial return generated from the campaign relative to its costs. This combination helps in determining not just the engagement level of the campaign, but also its overall impact on business objectives.

While other aspects like subscriber growth or design elements can offer valuable insights, they do not directly gauge the financial efficacy of the campaign. Therefore, focusing on metrics that reflect engagement and profitability is critical for refining future campaigns and driving better results.