There is a growing tendency for enterprises to act with greater socialenvironmental responsibilities and with the concern of contributing to the sustainable development of the economy In this context, the non-governmental organizations (NGO`s) have become widely recognized for acting in network near the enterprises, since the actions of social hallmark are in general not the focus. These organizations are gaining progressive force in the business world and are assuming the challenge of acting in the professional form with strategic vision to truly assume its social importance and guarantee its financial sustainability. To the managers of these enterprises, it is essential to recognize these new trends and factors of the market and the growing power of acting in network and mobilization of the involved parts. Therefore, the present inquiry intends to give double contribution: first to the academy, which was established in the 1990`s forming study- centers for the country and is focused on the relevant subjects to the third sector. Also to NGO`s that are clearly involved in the process of specialization of its management, which they are demonstrating to be a fertile land for professionals of administration. Still, it`s important to contribute with studies on the management of organizations in networks of relationships and at the same time apply and adapt to non-profitable organizations. Specifically to the Instituto da Criança, which holds the building blocks of evaluation for the strategic adaptation of organizations to act with alliances and networks used especially in organizations with profitable ends. The Instituto da Criança, the focus of this study, is a grateful NGO that has been active in Rio de Janeiro and works in networks with more than one hundred enterprises and hundreds of donors and volunteers with the objective to provide administrative, financial support and legal direction to eight social projects. The study is based on the presupposition that the organization, after going through a process of change in the last two years, is enlarging its team and structuring regional committees in São Paulo and New York. It demands a type of management that contemplates the evaluation of the strategic implications of these alliances and networks on its conduct and with its sustainability. Adopting the methodology of case study and of triangulation of the methods, social- environmental effects led to the spacious bibliographical inquiry on strategy, alliances, networks, third sector and corporative responsibility; data was collected through documentary inquiry, interviews near persons involved in the decision process, and through the application of questionnaires to obtain the perceptions of matching enterprises, volunteers and donors. The data was analyzed on this basis of theoretical referential system and the use of the adaptation of two models of strategic evaluation: from auto-analysis for non-profit organizations proposed by Peter Drucker (2001), and from strategic analysis in the relational perspective proposed by Macedo- Soares (2002). It became clear that the relational optics relevant to the relationships, especially alliances and the nets formed by these, adds value and new perspectives to the strategic decision, complementing the evaluation done only on basis of the macro-environmental, structural and organizational factors. The results indicate that the current strategy of growth of the NGO is correct but also needs to be revised in order to seize the current opportunities, since those in the context of the already existent network until all those for the expansion of its activities in the geographical scenery. The results indicate that the current strategy of growth of the NGO is correct but also needs to be revised in order to seize the current opportunities, since those in the context of the already existent network until all those for the expansion of its activities in the geographical scenery.