This study has discussed several crucial problems in ISMC, where conclusions are drawn as follows: 1) Themodificationoftheintegralslidingvariabledegrades the performance of the sliding mode. 2) ISMC belongs to a kind of GSMC. 3) The super-twisting high-order ISMC usually results in a stability condition that is infeasible in theory. Thelow-passfilteringsolutionwithoutthemodificationofthe integral sliding variable is suggested for chattering attenuation in ISMC. Comprehensive simulations have validated the arguments of study and have demonstrated a superior performance ofthesuggestedISMCdesignintermsofchatteringattenuation, trajectory tracking, and disturbance estimation. The application of the suggested ISMC to handle perturbations in composite learning control [34] would be interesting for further study.