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Za rješenje mnogih inženjerskih problema treba optimizirati polivarijabilne funkcije. Postoji nekoliko metoda optimizacije, a najjednostavnija od njih je Simpleks metoda. Simpleks zapravo predstavlja geometrijsku sliku definiranu brojem točaka (vrhova) koji je za jedan veći od broja dimenzije prostora. Simpleks u tri dimenzije je tetraedar, a u više dimenzija teško se može sagledati. Svrha je sekvencijalne Simpleks metode pokretati simpleks u područje optimuma, a odluke potrebne da bi se to postiglo ostvaruju se uz pomoć tzv. "pravila" Simpleks metode. U ovome radu korištena je Simpleks metoda s četiri faktora (varijable) za iznalaženje optimalnih uvjeta rada mikrovalnog uređaja "Milestone" MLS-1200 Mega System, pri određivanju suhe tvari jogurta. Utvrđeni su optimalni uvjeti rađa mikrovalnog uređaja (7 min. i 20 s pri 580 W te 5 min. i 20 s pri 420 W). Rezultati određivanja suhe tvari jogurta bili su identični onima određenim standardnom metodom., Sometimes it is necessary to optimize polyvariable functions in order to solve many engineering problems. There are a few methods for optimization and Simplex method is one of them. A Simplex is a geometric figure defined by a number of points equal to one more than the number of dimensions of the space. A Simplex in three dimensions is a tetrahedron, and in more dimensions the simplex is not easily visualized. The objective of the sequential simplex method is to force the simplex to move to the region of optimum response. The decisions required to accomplish this constitute are so called "rules" of the Simplex procedure. In this article an example of the Simplex method with four factors, for illustration this very useful method in searching the best working conditions in determination of total solids in yogurt by microwave heating on "Milestone "MLS-1200 Mega System is given. Optimal conditions were established (440s on 580 W and 320s on 420 W) and results obtained under these conditions were identical with results of standard method.