# Checks Everything in Check Sheet is based upon "checks", a check will monitor your spreadsheet for changes in the background and send you notifications if a certain condition is met. You can create several checks and we will evaluate the state of your checks whenever: * Your spreadsheet is updated * A form that is linked to your spreadsheet is submitted * Approximately once per hour When creating a check you specify the range of cells that you want to monitor which can be a single cell such as `A1`or an entire column such as \`B:B\`. In addition to the range you also specify a "condition" that we will evaluate against each of the cells in your range such as is the value equal to the text "Done" or is it greater than 5. If a cell in your monitored range is modified and matches your condition it may trigger a notification to be sent. Check Sheet will remember the positions of the cells in your spreadsheet that match the condition of your check so you won't be sent a notification more than once about the same cell. When configuring the [notifications](/concepts/notifications.md) for your check you can choose whether you want to be sent a notification every time a new value is found to match your condition or just the first time only. --- # 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://documentation.checksheet.app/concepts/checks.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.