Let G be a connected graph with at least two vertices and S a γt\documentclass[12pt]{minimal}
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\begin{document}$$\gamma _{t}$$\end{document}-set of G. A subset T⊆S\documentclass[12pt]{minimal}
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\begin{document}$$T \subseteq S$$\end{document} is called a forcing subset for S if S is the unique γt\documentclass[12pt]{minimal}
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\begin{document}$$\gamma _{t}$$\end{document}-set containing T. The forcing total domination number of S, denoted by fγt(S)\documentclass[12pt]{minimal}
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\begin{document}$$f_{\gamma _{t}}(S)$$\end{document}, is the cardinality of a minimum forcing subset of S. The forcing total domination number of G, denoted by fγt(G)\documentclass[12pt]{minimal}
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\begin{document}$$f_{\gamma _{t}}(G)$$\end{document} is defined by fγt(G)\documentclass[12pt]{minimal}
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\begin{document}$$f_{\gamma _{t}}(G)$$\end{document} = min {fγt(S)}\documentclass[12pt]{minimal}
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\begin{document}$$\lbrace f_{\gamma _{t}}(S)\rbrace$$\end{document}, where the minimum is taken over all minimum total dominating sets S in G. Some general properties satisfied by this concepts are studied. The forcing total dominating number of certain standard graphs are determined. It is shown that for every pair a, b of integers with 0≤a<b\documentclass[12pt]{minimal}
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\begin{document}$$0 \le a < b$$\end{document} and b≥1\documentclass[12pt]{minimal}
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\begin{document}$$b \ge 1$$\end{document}, there exists a connected graph G such that fγt(G)=a\documentclass[12pt]{minimal}
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\begin{document}$$f_{\gamma _{t}}(G) = a$$\end{document} and γt(G)=b\documentclass[12pt]{minimal}
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\begin{document}$$\gamma _{t}(G) = b$$\end{document}, where γt(G)\documentclass[12pt]{minimal}
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\begin{document}$$\gamma _{t}(G)$$\end{document} is total domination number of G. It is also shown that for every pair a,b of integers with a≥0\documentclass[12pt]{minimal}
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\begin{document}$$a \ge 0$$\end{document} and b≥0\documentclass[12pt]{minimal}
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\begin{document}$$b \ge 0$$\end{document}, there exists a connected graph G such that fγt(G)=a\documentclass[12pt]{minimal}
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\begin{document}$$f_{{\gamma }_{t}}(G) = a$$\end{document} and fγ(G)=b\documentclass[12pt]{minimal}
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\begin{document}$$f_{\gamma }(G) = b$$\end{document}, where fγ(G)\documentclass[12pt]{minimal}
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\begin{document}$$f_{\gamma }(G)$$\end{document} is the forcing domination number of G.
