The rural familiar agroindustry is an alternative in the search for new niche markets, using the greater diversity of existing products and product  differentiation by transforming them inside the property.  Its  implementation  is  considered  an  effective  alternative  as  policy  fot  Rural Development,  but  despite  all  efforts  there  are  many limitations  in  this  sector,  especially  in sanitary legislation. The aim of this study is to analyze rural familiar agroindustry, how these rules are built within the community and accepted by the farmers themselves, as the present production, laws and standards that qualify the agroindustrial production and The Theory of the Convention is based on mutual recognition and collective of wide quality of the product, and was used to explain how interactions are workedamong producers regarding production rules or “ways to make” the production process. 14 agroindustries in the Metropolitan Area oh Porto  Alegre,  in the  municipalities  of  Porto  Alegre,  Viamão,  Gravataí  e  Glorinha  were interviewed.  This  study was  characterized  by  an  exploratory  research,  whose  sample collection data was made through a semi-structured  field diary and secondary data. Content analysis  and  quantitative analysis  of  data  were  made.  The  construction  of  markets  and  the rules that govern them even with the compliance of  the law comes from within the process and  the  collaboration  of  all agents:  producers,  consumers  and  supporting  institutions  of  the sector.  The  incorporation  of new  practices  and  a  more  informed  consumer  and  acting  also brought reality for more interaction, where the construction market is made by all agents, and they use prior knowledge of each other to improve the quality of products and anything that makes up the market, thus consolidating a network of interactions also based on trust. Even with legal safeguards, such as labels and licenses  from the sanitary inspection, the assurance based on trust is the most important, combined withthe effective product quality. Quality is built on the agroindustries by looking not only at a physical process, but also relying on social and cultural aspects, considering personal efforts in making the products, dedication, tradition and artisanal “ways to make”, which bring the colonial touch. Utilizing the best practices in production  that  their  capital  investment can  provide,  emphasizing  quality  (presentation  of products and sanity), and sharing these premises with colleagues from fair and association, as with  consumers.  The  conventions  in agroindustries  already  exist,  and  are  followed  by producers  and  supervised  by  its consumers, which  all  contribute  and  build  collectively, exchanging information, monitoring and suggesting changes. Producers showed great effort in prospering and developing, but there must be government support and institutional basis for marketing, qualifying and adequacy of rules for family farmers.