RansS9
When conducting stall testing for certification there are two very different series of tests:
1. Handling qualities stalls and,
2. Performance stalls.
The handling qualities stalls are a series which include, straight, turning, low deceleration rate, high deceleration rate, power on/off, sideslip (some standards), in all configurations - as required by the applicable certification standard. The stalling speed doesn't matter too much during these tests.
The performance stalls are done to determine the stalling speed for the configurations required for certification.
During the tests various paramenters are measured which will require correction, during the data reduction process, to a standard datum, because they change during the flight. Other items will require correction due to the measurement method. Examples of corrections made during data reduction would be; weight, CG, position error, mach number correction (to stall Cl), approach rate, normal acceleration etc. Also, as the standard stall deceleration rate is 1kt per second, all performance stalls are conducted in descending flight, so a correction is required here as well.
So, to gather data, for a 1g stall speed aircraft, it would not be necessary to test a fully developed stall such as for a Vs min stall. Provided an obvious "g break" is recorded (g reduction as Cl max is passed during deceleration) it may not be necessary to fly any slower.
Remember, that for transport aircraft the actual stall speed is not important, it just has to be established. However, in a number of standards there is a maximum stall speed requirement - can you imagine arguing compliance with the regulatory authority over 0.25 kts in stall speed
Hope this helps, if too detailed, sorry - its not meant to be an egg sucking lesson!