At first, he thought that they should "take the victims out into the forest and shoot them in the back of their head" (Rapport The Last Days of the Romanovs: Tragedy at Ekaterinburg 176). But the issue was that this technique did not serve as an efficient method for a mass murder.
Then Yurovsky discovered that the assassination should take place in their house. At first the plan was to shoot them or stab them while they were all asleep or another scheme was "putting them together in one room and throwing hand grenades in on them...which could prove to be noise...and might easily lose control of the situation" (Rapport The Last Days of the Romanovs: Tragedy at Ekaterinburg 176). Each small issue with the earlier plans led to the creation of the final choice for the Bolshevik troops.
II. The FINAL PLOT for the Romanovs.
"Called in not a photographer with a tripod camera and a black cloth but eleven other men armed with revolvers. Five like Yurovsky were Russians, six were Latvians. Earlier . Two had refused to shoot the young women and Yurovsky had replaced them with two others. " ( Massie