Cause factor

Nature of variations

Method used to study variations

B_g

For one calendar year, all case files received N_cr, undergoes processing in the same environment, leading to processed and reported case file, N_cp.

Case-file backlogs were studied as function of time for case-files received and processed in Y2014, Y2015 and Y2016, as a function of time for all 52 weeks of the calendar years, and also as a function of laboratory disciplines within the FSL.

T_sc

All purchase orders are initiated and completed leading to a spread in the values of T_sc.

Turnaround time between different action points within the FSL

TAT for internal and external SCM processes during order processing.

TAT

All case files go through the process from receiving to collection.

TAT studied as function of time for case-files received and processed in Y2014 and Y2015, and also in different laboratory units.

A_b

All staff report to work daily, punch in and punch out leaving traces of absence or presence which can be measured.

Absenteeism studied as a function of time for three months periods of Y2016.

The studied covered factors affecting absenteeism such as departmental setups, zonal laboratories, skill levels, professions and gender.

A_d

All staff have own academic development profile.

Variations of A_d with time (Y2014, Y2016) for individual staff and by departments.

L_c

All staff have measurable complex longevity within the FSL.

Variations of L_c, L_ct and L_st with time (Y2014, Y2016) for individual staff and laboratory units.