What to do if production line OEE data is inaccurate? Lessons from manufacturing floor records

When OEE data is inaccurate, it's often not because the formula is wrong, but because the on-site recording was flawed from the start. The equipment stopped for three minutes, but the operator recorded it as 'waiting for materials'; the changeover was twenty minutes late, but the shift supervisor wanted to count it as 'planned downtime'; there were too many micro-stops, and no one wanted to…