The step wise procedure of drawing of isometric views of objects are presented in the subsequent examples. 

Example -1: Drawing isometric planes 
The step wise procedure for drawing isometric view of an object  having isometric planes only are shown in figure 2.

Figure 2. Step wise procedure of drawing the isometric view of the object

Step 1. Determine the desired view of the object. Here  the object will be viewed from above (regular isometric). The isometric axes is then drawn as shown in step-1.  
Step 2. Construct the front isometric plane using W and H dimensions. Width dimensions are drawn along 30o lines from the horizontal. Height dimensions are drawn as vertical lines.
Step 3. Construct the top isometric plane using the W and D dimensions. Both W and D dimensions are drawn along 30o lines from the horizontal.
Step 4. Construct the right side isometric plane using D and H dimensions. Depth dimensions are drawn along 30o lines and height dimensions are drawn as vertical lines.
Step 5. Transfer some distances for the various features from the multi-view drawing to the isometric lines that make up the isometric rectangle on the front and top planes of the isometric box.  e.g.  distance A is measured from the multi-view drawing./ It is then transferred along the width line in the front plane of the isometric rectangle.  Draw the details of the block by drawing isometric lines between the points transferred from the multi-view drawing. e.g., the notch is taken out of  the block by locating its position on the front and the top planes of the isometric box.
Step 6. Transfer the remaining features from the multi-view drawing to the isometric drawing. Block in the details by connecting endpoints of the measurements taken from the multi-view drawing.
Step 7. Darken all visible lines and erase or lighten the construction lines to complete the isometric drawing of the object