“…Some dPBL studies use synchronous interventions, requiring simultaneous interaction by students (Sulaiman, Atan, Idrus, & Dzakiria, 2004). Others use asynchronous technologies, allowing students to take part in discussions over a period of days or weeks (An & Reigeluth, 2008;ChanLin & Chan, 2007;Kenny, Bullen, & Loftus, 2006;McConnell, 2002;Steinkuehler, Derry, Hmelo-Silver, & Delmarcelle, 2002;Stewart, MacIntyre, Galea, & Steel, 2007). Still others combine the two, with some synchronous elements and some asynchronous (An & Reigeluth, 2008;Dennis, 2003;Gale, Wheeler, & Kelly, 2007;Ronteltap & Eurelings, 2002;Waters & Johnston, 2004).…”