These adjectives mean capable of occurring or being done. Possible indicates that something may happen, exist, be true, or be realizable: “I made out a list of questions and possible answers” (Mary Roberts Rinehart). Workable is used of something that can be put into effective operation: If the scheme is workable, how will you implement it? Something that is practicable is capable of being effected, done, or put into practice: “As soon as it was practicable, he would conclude his business” (George Eliot). Feasible refers to what can be accomplished, brought about, or carried out: Making cars by hand is possible but not economically feasible.Viable implies having the capacity for continuing effectiveness or success: “How viable are the ancient legends as vehicles for modern literary themes?” (Richard Kain).