When Ralph assumes leadership of the boys on the island in Lord of the Flies, he is full of plans. His two major plans are building shelter and making a signal fire on the moutain.
Both of these plans fail to be carried out as designed, but not through Ralph's fault or lack of strategy. In fact, in the beginning, Ralph's plans appear both prudent and achievable.
The failure of his plans are attributable to the "breaking up" of the group, which Ralph often laments. The signal fire goes out when Jack's hunters chase down and kill their first pig.
At a crucial moment, the fire goes out, just as Ralph spots a ship in the distance.
The hunters were responsible for keeping a rotating watch on the fire and easily could have done so. The failure to keep the fire going then was not due to Ralph's planning, but in the execution of the plan by the boys.
The shelters followed the same path to eventual failure. Each successive shelter is built by fewer boys as they lose interest and break away from the plan.