Delays are specific, singular events of conditions that result in the project completion and/or work actively starting or completing later than originally planned. Disruptions include the effects of individual or multiple delays, as well as interruptions to the planned method, manner, sequence, and duration of work activities directly and/or indirectly associated with the impacting event. Disruptions usually affect labor productivity and can cause significant cost overrun variances in labor budgets. Disruptions are often contributing causes to a project delay when the delay-related impacts ripple throughout the project to both the work activities directly changed and the unchanged work not directly affected.