Denna studie ger en insikt i Stockholms stads IT-kluster. Genom kvantitativ metod undersöktes hur området uppfyllde de tre krafterna inom agglomerationsekonomier, samt åsikter kring krafternas betydelser. Studien ämnade att särskilja IT-kluster från andra typer av kluster genom dessa krafter. Urvalet bestod av 98 respondenter som tillhörde IT-bolag inom Stockholms stad. “Knowledge Spillovers” och “Labour Market Pooling” uppfylldes väl. “Customer-Supplier Interactions” uppfylldes i mindre utsträckning, då det endast var tillgång till leverantörer som Stockholms stad uppfyllde. Resultaten visade på skillnader kring betydelsen av geografisk närhet till kunder mellan respondenter från mjukvaruproducerande och konsulterande företag, där den förstnämnda gruppen värdesatte detta lägre än den sistnämnda. Detta resultat var i enlighet med tidigare forskning. Ytterligare resultat som var i enlighet med tidigare kunskapsbidrag var betydelsen av “Labour Market Pooling”. / This study provides insight into the IT cluster of Stockholm city. It quantitatively examined how the area fulfilled the three forces within agglomeration economies, as well as opinions regarding the significance of these forces. The study attempted to differentiate IT-clusters from other types of clusters via these forces of agglomeration. The results were gathered from 98 respondents, who were employees of IT companies in Stockholm city. “Knowledge Spillovers” and “Labour Market Pooling” were well fulfilled. “Customer-Supplier Interactions” was less fulfilled, as only the need for access to suppliers was supported by Stockholm city. The results found significant differences regarding the importance of geographical proximity to customers between respondents from software and consulting firms. The former group valued this aspect lower than the latter. This finding was in accordance with previous research. Another result that was consistent with prior research was the importance of “Labour Market Pooling”.