In order for public transport organizations to move forward and to quantify effects occurring as a result of changes in strategic objectives, policies, decisions or lines of action, it is imperative to assess their performance. Key performance indicators (KPI) provide quick, adequate and reliable barometers assisting decision makers in identifying success stories, lessons learnt as well as problems and potentials, selecting courses of action, monitoring improvements, and evaluating results. Accordingly, choosing the right mix of KPIs relies upon a good understanding of what is important to an organization. Various frameworks can be employed to categorise and select required set of KPI. In this paper 3 frameworks are utilised to ensure an optimum categorization, selection and development of a KPI system for a public transport organisation. These are balanced scorecard framework, sustainability framework and input output analysis. The research employs the 4 perspectives of balanced scorecard (BSC) namely financial, customer, internal and learn and growth. Furthermore each of these and in a similar fashion is divided into another 4 sub perspectives of balanced scorecard ensuring coverage of 16 dimensions including public transport sustainability dimensions. Finally, input output analysis is conducted where four types of resources are required as input to a public transport organisation namely financial, staff, time, and physical (fleet & assets). The management of a public transport organisation is responsible to utilize these resources through operation of fleet, hence providing passenger transport services & financial outputs. Produced service outputs once used become consumed service outputs. These include: carried passengers, passenger.kilomtres & passenger hours. As a result of utilization of produced service, financial output is generated as operational revenue obtained through fare collection.