What constitutes 'effective assistance of counsel' under the Strickland v. Washington standard?

• A. Counsel's conduct only matters if it directly led to an illegal conviction.
• B. Any misstep by counsel; prejudice need not be shown.
• C. The defendant must show actual innocence.
• D. Performance that is deficient and prejudicial, causing a reasonable probability of a different outcome; both prongs must be met.

Answer: (D)

Effective assistance of counsel requires two things to be true at the same time: the lawyer’s performance was deficient, and that deficient performance caused prejudice to the defense. Both parts matter.

Deficient performance means the attorney’s acts or omissions fell below the standard expected of a reasonably competent attorney. There is a strong presumption that counsel's conduct was reasonable, reflecting professional norms and strategic choices. A claim arises when the attorney’s decisions or failure to act fall outside what a normally skilled lawyer would do in similar circumstances, such as failing to investigate key evidence, failing to file important motions, or not consulting with the client about crucial strategic options. But not all poor outcomes mean deficiency; courts give deference to legitimate strategic decisions.

Prejudice means there must be a reasonable probability that, but for the lawyer’s deficient performance, the result of the proceeding would have been different. This is more than a mere possibility; the likelihood of a different outcome must be substantial enough to undermine confidence in the verdict or sentence.

Because both elements must be satisfied, a finding of ineffective assistance does not arise from poor performance alone, nor from prejudice alone. The standard is grounded in ensuring that the right to effective representation is meaningfully protected without every subpar decision automatically overturning a conviction.