Date of case-file movement from one work station to another	Symbol	Formula	Definition of time interval
Date in	A	-	-
Sample receiving date	E	-	-
Date SRF submitted to CGC	F	t₁ = F - E = F - A	Sample receiving officer to CGC
Date released by CGC	I	t₂ = I - F	Office of the CGC
Date submitted to director	J	t₃ = J - I	CGC to Director
Date instructions released by director	L	t₄ = L - J	Director’s Office
Date instructions released by manager	N	t₅ = N - L	Instructions
Date samples received by analyst	P	t₆ = P - N	Manager to Analyst
Date analysis commenced	R	t₇ = R - P	Sample receipt by analyst, start of analysis
Date analysis was completed	S	t₈ = S - R	Sample Analysis time
Date report completed	V	t₉ = U - S	End of Sample Analysis, start data interpretation
Date report submitted for review	W	t₁₀ = V - U	Start of report write up
Date review comments availed	X	t₁₁ = W - V	Complete report, submit for review
Date report submitted for approval	Y	t₁₂ = X - W	Time to review
Date approved by manager	Z	t₁₃ = Y - X	Report Revision time
Date report submitted for approval to director	AA	t₁₄= Z - Y	Time for approval by Laboratory Manager
Date report approved by director	AB	t₁₅ = AA - Z	Time for approved report to reach FSL Director
Date submitted for approval to CGC	AC	t₁₆ = AB - AA	Director’s approval time
Date approved by CGC	AD	t₁₇ = AC - AB	Time for approved report to reach CGC
Date report received by SRO	AE	t₁₈ = AD - AC	Final Approval time (CGC’s approval)
Date report collected by client	AF	t₁₉ = AE - AD	Final approved report to reach SRO
Date report collected by client	AF	t₂₀ = AF - AE	Time report received by SRO until collection by client (time approved report stays at SRO)