Piloted semi-automated mechanisms for monitoring and managing Virtual Organizations (VO) on the bases of established trust for collaboration that has already started need to be developed. Various researches in dynamic VOs have not established a semi-automated solution to manage the changing trustworthiness of the partners in the collaboration. The experimentation on semi-automated analysis of dynamic trustworthiness of VO indicates that a statistical standard deviation model promises more to be used to assess partners who sustained trust or failed to sustain trust in a period of time. This paper proposes a semi-automated TrustSEv (Trust Sustainability and Evolution) system for assessing partner’s trust sustainability in the VO during evolution phase. Further, the paper establishes a linear relationship between objective trust level of the individual partner constituting the VO, and the strength of the VO itself.