More accurate prediction of future demand (or needs) for land for outdoor recreational activities would significantly improve land use planning. Unfortunately, prediction of demand (or projected use) is difficult. Most standard predicting measures have little or questionable relevance to outdoor recreation. Straightline projections of past outdoor activities are of limited use as technology, income, leisure time, mobility, and habits are changing so fast that it is doubtful if the past may be used to predict the future. In fact, all methods of predicting (or projecting) future demand (or needs) on the basis of past trends are inoperative in periods when there is rapid change in all the components influencing the trend, as well as in life styles. Surveys and questionnaires are of some use, but their value is limited by the propensity of respondents to give answers which they think are expected and the fact that they cannot appraise their future attitude towards activities with which they are now unfamiliar.