A Brief History of TPACK

[1986]  
Shulman says pedagogy and content knowledge (PCK) must be considered together.

[2000]
Hughes add technology to form TPCK (Technological Pedagogical Content Knowledge

[2006]
Mishra and Koehler articulate the interdependence of content, pedagogy and technology knowledge

[2007]
TPCK becomes TPACK as Thompson and Mishra say it better represents the interdependence of the three domains and represents the "Total PACKage" of teacher knowledge required for technology integration.

[2012]
TPACK becomes Tech-PACK as Roblyer and Doering emphasize the critical contribution of technology to teaching.

(Source: Roblyer & Doering (2013))