“…The PBL developed at McMaster University four decades ago (Barrows & Tamblyn, 1976, 1980, has grown as an interactive instructional strategy in medicine, engineering, and education (Edens, 2000;Edwards & Hammer, 2004;Eldredge, 2004;Fink etal., 2002;Jones, 2006;Şahin, 2009a;Selcuk & Şahin, 2008;Stonyer & Marshall, 2002). In addition, PBL has equally been used in physical science subjects like physics (Duch, 1996;Iroegbu, 1998;Raine & Collett, 2003;Şahin, 2007;Şahin, 2009b;Şahin & Yörek, 2009). It is evident that PBL has been researched into and very well documented as an effective strategy in enhancing students' learning outcomes in varied school subjects across many countries in Europe, America, Asia, and Africa (Albanese & Mitchell, 1993;Berkson, 1993;Colliver, 2000;Major & Palmer, 2001;Norman & Schmidt, 1992Prince, 2004;Vernon & Blake, 1993) but its effectiveness in Nigeria is yet to be confirmed (Fatade, Arigbabu, Mogari & Awofala, 2014).…”