Sentence:  Evangelism and congregational outreach have not been carefully studied in the churches ; one study in <WSD>Pittsburgh</WSD> , however , has illuminated the situation . 
Meaning of the word marked with <WSD> tags:  a city in southwestern Pennsylvania where the confluence of the Allegheny River and Monongahela River forms the Ohio River; long an important urban industrial area; site of Carnegie Mellon University and the University of Pittsburgh