“…A four-categories model [27] of TT, according to strengths, limitations and focusing consists of 1) a category of traditional models, composed by appropriability, dissemination, and communication models, 2) 1990's models including the Gibson and Smilor model [28], Sung and Gibson model [29], and Rebentish and Ferreti model [30], 3) Knowledge-based model [27,31,32], and 4) organizational learning models [33] (Table I). The last two categories may be thought as two sides of the same coin.…”