質詢是議員監督政府的重要方式之一，在過去相關研究中，學者們大多以質詢問題的數量或涵蓋的政策領域來衡量議員的表現，對於議員質詢強度的分析比較少。因此，本文依據Maricut-Akbik（2021），將議員質詢的內容分成四個不同質詢強度的類別；由低至高分別是：要求資訊、要求說明解釋、要求政府改變、譴責威脅制裁。本文分析苗栗縣第十八屆議會議員的口頭質詢，來探討不同政黨與派系的議員，其監督的強度是否有所差異。研究結果顯示，不論是哪一黨派議員，在其質詢內容中，最常提出的問題類型是要求說明解釋，其次則是要求資訊，譴責威脅制裁的問題數量是最少的。另外，統計分析的結果顯示，相對於執政的黃派議員，反對黨議員所提出要求說明解釋、譴責威脅制裁的問題數明顯較多；反對派的劉派議員在譴責威脅制裁的數量上也是明顯較多的。因此，反對黨及執政黨內的反對派議員在質詢時的強度是較高的。

Questioning is one of the crucial ways for legislators to oversight the government. Past research has primarily focused on measuring the performance of legislators through the number of questions they submitted or the range of policy areas that their questions covered, and research that analyzes the intensity of the question is scarce. To address this gap, this article employs a method developed by Maricut-Akbik (2021) to classify each question into four levels based on its oversight intensity. From the weakest to the strongest, the four levels are: 1) requests for information; 2) requests for justification; 3) requests for a change; and 4) requests for sanctions. This article examines the oral questions submitted by county councilors from the eighteenth council of Miaoli County, specifically examining whether oversight intensity varies between different political parties and factions. Results indicate that regardless of political parties or factions, the most common questions submitted by councilors are ones that request for justification, followed by requests for information, and, least commonly, requests for sanctions. Furthermore, councilors from the opposition party camp, the pan-green camp, submitted significantly more questions requesting justifications and sanctions than the ruling faction. Additionally, despite belonging to the same political party camp as the ruling faction, the councilors of the opposition Liu faction submitted significantly more questions that requested sanctions compared to the ruling faction. In conclusion, this article finds that the intensity of questions by the opposition party and opposition faction councilors is relatively stronger than the councilors of the ruling faction.