# Definitions ## Type of users ### Eligible An **eligible** user is a user who belongs to at least one group invited to participate to the challenge. ### Registered A **registered** user is a user who has accepted the invitation and registered to the challenge. Registration is not automatic and a user is not obliged to participate. This is why he must register. ### Ranked A user is **ranked** if he has fulfilled the minimum conditions for access to the general ranking. These conditions are based on a minimum number of trips recorded and a minimum distance covered during the challenge. If the user does not meet these conditions, they will not be ranked or rewarded. ## Pre & post challenge periods In order to measure the effect of a challenge on a driver’s behavior, we compare the average score during the challenge with the one computed during a period of 14 days preceding the date of the start of the challenge **minus 10 days**. Similarly, to know if a driver maintains his efforts after a challenge, it is also interesting to compare his average score during the challenge with the one measured in the period following the challenge. The average score after the challenge is calculated over a period of **14 days** following the end date of the challenge **plus 10 days**. To measure progress, we only consider drivers who have completed at least **10 trips** in the pre challenge period. In short, if there are not enough trips recorded, the average does not allow an accurate evaluation of the user's driving behaviour. The figure below shows the time periods during which average scores are calculated before, during and after a challenge.

Schema representing the pre-challenge and post-challenge periods — Definition of the pre- and post-challenge periods. The pre-challenge period stops 10 days before the challenge starts, and the post-challenge period starts 10 days after the challenge ends. Each period is 14 days long.

--- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.drivequant.com/backend/challenges/definitions.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.