We are a breed apart in the retrospective delay analysis industry. We are the experts in the modelling of delay quantification and development of the theory for each industry methodology. The delay analysis industry has not, for reasons unknown, produced mathematical expressions (formulas) for each known delay analysis methodology.  We have. We created the industry state-of-the-art Contemporaneous Period Analysis methodology and the state-of-the-art Cascade Analysis methodology.   Period Analysis is the only methodology that most closely replicates the live scheduling environment and mathematically most accurate retrospective methodology in the industry. We are the gurus of this approach and if the data is sufficient, it is our go to methodology. On the other end of the spectrum, Cascade Analysis is the application of a unique modelling technique coupled with barchart critical path theory to quantify delay of materially deficient schedules when no other retrospective methodology is suitable. We know the strengths and weaknesses of the other methodologies, and processes by which other experts adjust and/or alter a schedule to support a narrative. Our 100% success rate as independent retrospective schedule delay experts is due to our providing highly accurate and thoroughly substantiated analysis and conclusions, and superior testimonial expertise.