Abstract

Since the pandemic era of the Covid-19, there are many businesses grow exstensivelly, such as IT business or digital services and coffee shops business. There are many reasons to love coffee shops, let’s say, for having a great taste from our favourite coffee shops, looking for good vibes and being connected with friends. During last four years, Indonesia’s domestic coffee consumption also continues to rise about 50 percent.

Among coffee connoisseurs, taste is an important indicator of the enjoyment of drinking coffee. For coffee shop businessmen with manual brewing methods, two factors that need to be considered are the water temperature (x₁) and the coffee beans density (x₂). Roaster usually combines the level of the two factor by guessing. The inaccuracy of the combination of the two factors level can affect the quality of the taste of the coffee.