Dol, S.M. and Halkude, S.A. 2017. An Effectiveway to Improve Problem Solving Skill Using TPS, T24S and T21S:A Comparative Study. Journal of Engineering Education Transformations. (Jan. 2017), 219–228. DOI:https://doi.org/10.16920/jeet/2017/v30i3/110570.