Which type of committees primarily focus on legislation outcomes and policy implications?

House Substantive Committees focus specifically on evaluating and shaping legislation in relation to their respective subject areas. These committees are tasked with examining the details of proposed bills, discussing their potential impacts, and making recommendations based on their findings. They play a critical role in the legislative process as they scrutinize how legislation aligns with policy goals and the needs of constituents.

In contrast, ad hoc committees are typically formed for a specific purpose or task and may disband once that task is completed. House procedural committees deal with the processes and rules governing legislative procedures, rather than the substantive content of legislation itself. Conference committees are created to resolve differences between the House and Senate versions of a bill when they have passed different proposals; while they play a vital role in finalizing legislation, their primary focus is on reconciling differences rather than policy implications or outcomes of legislation on their own.

Hence, House Substantive Committees are uniquely positioned to delve into the effectiveness and consequences of legislative proposals, making them the correct choice for focusing on legislation outcomes and policy implications.