To evaluate the effectiveness of TDM, a program must first set objectives, identify indicators and then choose measures to evaluate success based on those indicators. Objectives are the overall goals of the program. They should reflect the purpose of the organization and the intention of funding bodies. Indicators describe the desired output or outcome based on the objectives set for the program. It describes an attribute of the programs performance. Measures are the means used to quantify or qualify the indicator. Measures can be quantifiable values such as percentages or rates, or they can be clearly defined qualitative values such as high, medium, low. Measures must be monitored at regular intervals to show changes over time. For a TDM program, an example objective may be to lower travel by car with an indicator of reducing VKT by 5% a year. The measure would be the year-to-year change in VKT