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     \textbf{Technique title} & \textbf{Most frequent sub-technique} & \textbf{Limitations} \\
     \hline
     \multirow{4}{2cm}{Judgmental technique} &\multirow{2}{2cm}{Supervisor estimates}& It heavily depends on managers’ opinions [3, 8] and it lacks accuracy [3]. \\
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      &  &  It often degenerates to some sorts of bargaining and is influenced by personal relations [8]. \\
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      & \multirow{2}{2cm}{Delphi method} & It has high dependency on experts’ opinions, which may not yield accurate estimations in the end [9]. \\
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      & & It can be a time-consuming process, requiring a substantial amount of costly execution time [9] \\
     \hline
     \multirow{4}{2cm}{Quantitative technique} &\multirow{4}{2cm}{Markov chain} & It is highly connected to mathematical aspects [19]. \\
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     & & It is linear in the sense that it does not incorporate feedback mechanism [9, 18]. \\
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      & & It extremely relies on sample size for statistical reasons in a way that the number of people in classes must be large; otherwise, transition probability estimates will tend to be unstable [18]. \\
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      & & It is not capable of interacting with its environment; for example, entry and exit of entities in a system cannot be easily modeled [9]. \\
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