This paper proposes a collaborative approach for personal task management which is modeled as an alliance model. Alliance model is based on information sharing and collaboration of several persons. The users disclose their task condition and maintain to be updatable by their friends. To avoid privacy issues we propose emergent group discovery algorithm to control the level of disclosure. We implement client/server system on cellphones environment. We remark the advantages of our approach with experimental evaluations. KEYWORDS collaborative scheduling, social network, cellphone application