Problem - Decision makers shape the structure of the sales function, but it is unclear how they go about it and why. The rationale for making certain decisions need to be analyzed in order to understand why different decision makers apply different sales strategies. Topic - The Swedish prefabricated wooden house industry consists of many actors with no clear market leader. The sales force seems to mainly consists of external sales agents (manufacturers' representatives, also called reps), though some manufacturers also employ direct sales agents at the manufacturing company. Prefabricated wooden houses corresponded to 86% of all building permits requested during 2015. Purpose - This thesis aims to explore decision-makers' rationale behind the organization of manufacturers' sales forces in the Swedish prefabricated wooden house industry. Method - Semi-structures interviews with decision makers at manufacturing companies in the Swedish prefabricated wooden house industry have been conducted in order to fulfill the purpose of this study. The empirical findings are then analyzed based on theory that has been collected through partly inductive, partly deductive approaches. Main results - Decision makers use different arguments to justify their strategies. Many different rationale applied translates into no clear pattern besides the one that there seems to be no clear pattern. Arguments for a rationale decision are given without analytical proof for an assumption. Some interviewees are in essence for an integrated sales force, though might also work with reps.