# 49. Manipulation of bias and heuristics in decision making ## 49.5. Methodology/Refinements/Sub-species ### 49.5.27. Hard-easy effect Based on a specific level of task difficulty, we naturally overestimate our ability to complete simple tasks whilst underestimating our ability to complete complex tasks. A manipulator can take advantage of this bias by deliberately under or overestimating the difficulty of a victim's task.