Several DTA experiments followed by calorimetric works are reviewed here to emphasise the importance of complementary role
of both techniques. The thermal analysis is advantageous in the sense that it gives quickly the overall view of thermal behaviour
of a material under various conditions. Calorimetric work provides accurate heat capacity data which enable to derive thermodynamic
functions including the enthalpy and entropy. The latter quantity is especially important in judging whether the material
obeys the third law of thermodynamics. However, calorimetric work leads occasionally to an erroneous conclusion if the work
is not preceded by thermal analysis performed under various conditions. Sometimes, quality of information obtained by DTA
exceeds that obtained by laborious calorimetry.