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A landslide is a disastrous event and harms livelihood with varying degrees based on the nature of the landslide. Such a geological event leads to damages to the country's valuable infrastructure and resources. Scientifically designed proper and effective remedies for such a natural disaster are need-of-hour. We can prevent such a hazard by either of two things, first by delivering proper construction maintenance of slope by stabilizing it or by removing an unstable part of the hill and second by detecting the hazard before it happens to move safely costly equipment and people from the landslide-prone site. Sometimes even after providing proper stabilization to the slope, it may fail due to unavoidable natural climate; it is needful to use early warning systems (EWS) and monitoring to ensure infrastructure and human lives. To monitor and develop an EWS, one needs to know the risks that threaten stability. Again, stability is also affected by more than one factor such as the soil's physical and mechanical properties, morphology and geology of the earth, presence of cracks and fissures in the slope of the ground etc. To understand such a complex geological event, the need to find out these properties is crucial. Such a complexity shows that developing a landslide, EWS finds complicated task and needs to correlate multidisciplinary knowledge to solve the problem faced during designing and producing an alert system to the society. In this study, a historical trend in the advancement of the landslide EWS with existing warning systems along with their advantages and disadvantages is discussed; it can be helpful to the researchers to get an idea about what should be done to improve to make more efficient landslide early warning system for landslides.

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