The simplest way to find out if the silt is a niche silt or not, is to execute, normally in the middle of the 20 cm depth intervals, some short “A and deflate” dissipations, without expansion from A to B, i.e. without movement of the membrane. An adequate duration of these dissipations is two minutes, hence much shorter than DMTA dissipations where the entire S-shaped curve is obtained. These short dissipations permit to find out if appreciable A reduction occurs during the test. If the A-decay in the initial 0.5 minutes is appreciable, then the soil is a niche-silt, i.e. there is appreciable dissipation during the test. Conversely, if A is relatively constant in the initial 0.5 minutes, then the test is either fully drained or fully undrained. In sands the A-reading is constant because there is no excess pore pressure due to the penetration. In clay the A-reading is constant because the excess pore pressure caused by the penetration has no time to dissipate appreciably during the test. The horizontality of the short DMTA dissipation excludes that the soil is a niche silt. Quantitatively, it can generally be excluded that a silt is a niche silt if, in a short two-minute A-only dissipation, the A reduction in the two minutes is less than 5%. An adequate number of short dissipations in niche silts sites is 10 dissipations in a DMT sounding. If the soil is not a niche silt, then the interpretation can proceed normally, using the common interpretation formulae.