# Time Aspect ### Continuous (otherwise known as "American" style barrier) Refers to the time aspect of the barrier condition. A continuous barrier means that the option will be knocked in (knocked out) if the spot rate trades at or through the barrier at any time prior to expiry. ### Window Also refers to the time aspect of the barrier condition. A window barrier means that the option can only be knocked in (knocked out) during a predetermined specified period. The main types of window barrier are: Forward Barrier - Forward Start means that the barrier is inactive for the first part of the option's term and can only be triggered after an agreed date till expiry. Partial Barrier - Means that the barrier is active only for a period from the transaction date to an agreed date and can only be triggered during this period. ### "European" style barrier Means that the barrier condition is only active at expiry of the option. --- # 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://eako-capital.gitbook.io/eako-user-guide/barrier-options/time-aspect.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.