starts on Day 8 and continuing until Day 21. The work crew occupies 300 m of the site during each day. The progress rate can be recognized by the slope of the activity along the time axis: Slow progress would show as steeper incline, fast progress would show a moderate incline. In Exhibit 1, Activity 1 has a progress of 100 m per day (1,100 m in 11 days), Activity 2 has a progress of 150 m per day (900 m in 6 days). Depending on the direction of the work, an activity line would decline or incline towards the completion date. If the progress of an activity would depend on location specific parameters (such as soil removal), the activity would show as non-linear line. Exhibit 5 shows such an activity. Even more complex graphics are produced when the progress rate considers specific work times (shifts, holidays, and off-periods). Exhibit 6 shows activities from previous exhibits but this time having no progress on the weekend days (Day 7 of each week). When planned activities are displayed as lines, actual and forecast progress can be mapped as dotted or dashed line on the same axes to provide actual vs planned progress. Annotations such as boxed text and activity labels within the drawing area improve the level of information. Tools Time–distance diagrams can be created using any kind of drawing tool, certainly one which allows scaled drawing (for example, CAD editors, Visio). Sometimes, spreadsheet tools are employed where the width of the columns and the height of the rows form the distance and time scales. However, in real project life, a time schedule needs to be adjusted continuously: This is when the use of specialized tools quickly brings out their advantage. These tools (see External links below) are project management tools in their own right with an emphasis on the ability to present the time schedule as time–distance diagram. Activities can be edited using project management terminology plus all drawing attributes for the activity's shape. Special features allow dependency links (with lags), complex scaling, access conflict detection, resource-dependent progress, and more. Most often, such tools provide various interfaces to other project management software, at least to import and export activity information. Complex systems (such as TimeChainage, DynaRoad, TILOS or Time Location Plus) even integrate into commonly used project management software (Primavera, Microsoft Project, Asta Powerproject). See also Linear scheduling method List of