手法を比較

	Encounter Norm Analysis	Recreation Substitutability Analysis
分野	Sport Leisure Studies	Sport Leisure Studies
系統	Process / pipeline	Process / pipeline
提唱年	2007	1991
提唱者	Jerry J. Vaske, Bo Shelby, Alan R. Graefe & Thomas A. Heberlein; Robert E. Manning	Bo Shelby & Jerry Vaske; Seppo Iso-Ahola
種類	Field-survey normative pipeline for recreation encounter standards	Applied analytic pipeline for recreation substitution
原典	Vaske, J. J., Shelby, B., Graefe, A. R., & Heberlein, T. A. (1986). Backcountry Encounter Norms: Theory, Method and Empirical Evidence. Journal of Leisure Research, 18(3), 137-153.	Shelby, B., & Vaske, J. J. (1991). Resource and Activity Substitutes for Recreational Salmon Fishing in New Zealand. Leisure Sciences, 13(1), 21-32.
別名	Normative Approach to Recreation, Encounter Norm Curves, Social Norm Analysis (Recreation), Norm-Prevalence Analysis	Leisure Substitutability Analysis, Recreation Substitution Assessment, Activity-Resource Substitution Analysis, Substitutability of Leisure Behavior
関連	4	4
概要	Encounter norm analysis is the normative-survey pipeline used to set standards for visitor impacts in parks and protected areas. Building on Vaske, Shelby, Graefe, and Heberlein's 1986 formalization of backcountry encounter norms, it asks recreationists to evaluate the acceptability of a range of conditions — most classically the number of other groups encountered per day, but also people at one time, campsite sharing, or depicted impact levels — and aggregates those evaluations into a social norm curve. The curve locates the minimum acceptable condition where acceptability crosses from positive to negative, supplying a defensible numeric standard. The method also quantifies the structural properties of norms: their intensity (how strongly conditions are evaluated), prevalence (whether respondents hold a norm at all), and crystallization (the degree of agreement), the last now commonly indexed by the Potential for Conflict Index (PCI2). Robert Manning's synthesis in Parks and Carrying Capacity made this normative approach the empirical core of indicators-and-standards frameworks.	Recreation substitutability analysis studies the interchangeability of leisure experiences, asking when and for whom one recreation activity, site, or time can acceptably replace another. Bo Shelby and Jerry Vaske's work, exemplified by their 1991 study of salmon fishing in New Zealand, organized substitution into distinct types, varying the activity, the resource or setting, the timing, or the strategy of participation, and measured anglers' willingness to accept each kind of substitute when their preferred option was unavailable. Seppo Iso-Ahola's 1986 theory framed substitution as a psychological process in which perceived freedom of choice is the critical mediator: people substitute more willingly when they feel they are choosing rather than being forced, and when the alternative shares the valued qualities of the original. The analysis combines a typology of substitution with measures of willingness conditioned on choice freedom, the quality of alternatives, and recreationists' specialization and commitment.