Abstract: This paper presents the author’s considerations on several parameters and concepts that are commonly misused by the practitioners. These parameters/concepts are: index properties for design can be selected from the local practice; difference between the net additional effective stress and the footing pressure; design parameters for layered soil can be taken from the layer thickness weighted average; the mechanism of the quick sand is essential the same as the liquefaction; the relief platform should be close the bottom of the retaining wall. The paper presents the correct parameters and concepts.  

Key words: Geotechnical Engineering, Weighted Average, Seepage Force, Intrinsic Index, Quick Sand, Liquefaction