Between subjects:  Comparisons of data between two groups of people doing the same task or under the same condition.

Captive transit users: Those people who have no other transportation options or access modes; usually non-drivers such as the poor, young, or those with certalin disabilities.

Cognitive maps: The internal mental representation of spatial knowledge.

Constraint: A factor that limits travel and activity particpation, such as time or the inability to use specific modes of travel.

Construct validity: The belief that the experiment accurantky mesure the theory being tested.

Contingent valuation method: Ssurvey methods designed to elicit the monetary benefit people place on goods or services.

Convergent validity: The belief that a theory which is supported by various types of experiments has more validity than one with fewer supporting types. Also called methodological convergence.

Cumulative opportunity measures: The number of locations that serve a particular need within a specific time or distance range.

Distance decay: A geographical term describing the restricting and limiting affect of distance on interaction between two locations.

Economic rationality: The classical view that decisions are made by those with complete and rational knowledge of he situation.

External product: The type of testing technique used to measure the internal cognitive map knowledge.

GPS: Global Positioning Systems (the array of orbiting satellites that provide latitude and longitude information).

Gravity measure: Based on the Euclidean measure, it measures the affect of human attraction between physical attractions and the friction to overcome distance.

Hidden demand: The transportation or access demand that is realized after a link has been improved.

Independent: Those who can travel without assistance.

Individual accessibility: As opposed to aggregate or location-based accessibility, individual accessibly attempts to measure the access or freedom allowed to a single person.

Inter-point distance measures: A method that determines a person's estimations of the distance between a group of points.

Means diamonds: Show the 95% confidence levels. If the diamonds of several tests overlap, there is no significant difference betwen the results.

Methodological convergence: The belief that a theory which is supported by various types of experiments has more validity than one with fewer supporting types. Also called convergent validity.

Place or location accessibility: Measures the accessibility of physical locations to each other, rather than how people actually access the environment.

Pointing task: Used to measure a person's responses when asked to point to variouslocations.

Regular method: The manner that blind people usually use, mostly using a cane or a guide dog, in this experiment, they used no other technology aid.

Relative access measure: The measure of the extra time or distance effort betwen people with various degrees of mobility or access modes.

Relative accessibility: The measure of the extra time or distance effort betwen people with various degrees of mobility or access modes .

Resistance: A measure of the difficulty that must be overcome to enable travel.

RIAS: Remote Infrared Audible Signage.

Sentence framing: A technigue where the subject fills in or completes a sentacne or phrase.

Space-time prisms: Hägerstrand's model which shows the time and direction of travel during a person's daily life.

Spatial knowledge: The degree of awareness about an environment.

Spatial products: Tests used to neasure the internal spatial knowledge or mental map information.

Time Geography: Introduced by Hägerstrand to show how overcoming distance consumes a person's limited time, therfoire time constraints directly affect travel and spatial behavior.

Time penalties: The additional time needed to perform the same function or trip as a typical user.

Utility function: the benefits derived from performing a task.

Utility measures: A method to put an empirical value on the utility of performing a task.

Willingness To Pay: Survey methods that mweasure monetary beneifts of various scenarios or activities.

Within subject: Comparisons of data with the same subjects under different conditions.

Zero sum game: A situation where a gain by one party must lead to a loss for another.