What are the reason for made this struggles successful?

The call for indefinite strike was given by the SPA or the Seven Party Alliance in Nepal. This alliance included some big parties that had some members in the Parliament. But the SPA was not the only organisation behind this mass upsurge. The protest was joined by the Nepalese Communist Party (Maoist) which did not believe in parliamentary democracy. This party was involved in an armed struggle against the Nepali government and had established its control over large parts of Nepal. The struggle involved many organisations other than political parties. All the major labour unions and their federations joined this movement. Many other organisations like the organisation of the indigenous people, teachers, lawyers and human rights groups extended support to the movement.