A Gantt chart is a tool for project management developed originally by Henry Gantt in the early s. It is a type of bar chart that shows the start and end times for each task in a project schedule. The tasks are usually categorized using a work breakdown structure with summary tasks for the main project deliverables and sub-tasks that break the project down into a detailed and manageable task hierarchy. If you use Excel or Google Sheets, you can create this type of project schedule with almost no learning curve by downloading Vertex42's free Gantt Chart Template.
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These article describes how to connect to a Microsoft Access database file, if you use a MS Windows operating system. This description has been tested on WinXP Home, for other Windows versions it might work a little differently. The two versions the former and the latter are not compatible. On one hand ACCDB doesn't know user based security, on the other hand you can work with attachments inside the database file, for example.
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LibreOffice Calc is the spreadsheet component of the LibreOffice software package. After forking from OpenOffice. Additionally, Calc now supports 1 million rows in a spreadsheet  with macro references to each cell. Calc is capable of opening and saving most spreadsheets in Microsoft Excel file format. In its internal data structure, Calc until version 4.