Latest version of WFS/RWF software
The latest version of RWF/WFS, released by the WFGD, is version WFS 7.75 of January 2017, inwhich the Export function is extended with the choice between a plain txt-file and a csv-file. In the cvs-file exportation, the 2 formulae for summation are being preserved.
After the study of Mental Load, we looked more intensive into the time for Rn and De. From this study new rules were developed.
11.3. ACTING, Rn
With this is understood the time span between the actual seeing (or hearing or feeling) of an action signal and the start of the following action as a reaction on basis of recognized information.
Anticipated or Unanticipated signal.
On a category A signal can be anticipated fully, because the signal is known as well as the time the signal will be noticed.
On a category B signal can be anticipated, because the signal is expected but it is not known which signal or when it is to be noticed exactly.
On a category C signal can not be anticipated, because the signal is not expected and the time it will be noticed is not known.
11.3.1. React (Simple React)
With reacting is understood the undertaking and starting of an action on basis of the recognized information. The time tabel gives for react Rn = ! = 2 RU.
Simple react is the reaction on 1 action signal, as on a light, sound or pressure signal. This will only be valued in time when a reaction on an UNANTICIPATED signal is needed. Reaction on a anticipated signal is not rewarded in time.
Examples of simple react:
1. A worker operating a machine knows exactly that the machine will stop at the end of the cycle or task and that he
must pull a handle immediately, if so; cat A. So, no time for react.
2. A worker looks at a little lamp: as soon as it lights up, he must press a knob. Cat B; no time for react.
3. On a wiring machine the horn will sound loudly on the breaking of the wire. This sound is unexpected, cat C. Therefore
time for react must be given before the next action will take place.
11.3.2. Decide (Choice React)
When a choice must be made out of more than 2 possibilities each with a corresponding action, only then time may be rewarded for reaction time. So, a simple yes/no decision is not rewarded in time, as the time is already compensated for in the inspection time, Ins, itself.
If, after the inspection (Ins), a decision is needed out of 3, 4 or 5 possibilities which can be anticipated upon, so cat. B, than a time of 2 RU is rewarded. For a decision out of 6, 7 or 8 possibilities a time of 2 x Rn = 4 Rn will be rewarded.
If no anticipation is possible, cat. C, for every 2 possibilities a time of 2 RU will be rewarded up to a maximum of 8 possibilities.
Examples of choice react:
1. Playing cards must be sorted into 2 stacks: red and black. No time for decision: choice from 2 possibilities: Fo, Ins.
2. Playing cards must be sorted into 4 stacks: spades, hearts, diamonds and clubs. Choice from 4 possibilities each with
different action. Time for reaction is rewarded: Fo, Ins, 1 Rn.
Because of the finding and study of an old article about Measuring Mental Load or Strain with RWF, we were enthou-siastic and confident to implement the findings in the RWF software. During manual labour signals are send and received by the brain regularly and continously in order to execute all the motions of a task good and adequately. This results in a mental load, especially when (too) high and (too) low mental strain alternate frequently and/or continue for too long.
Mr. Joachim Kurz of the WFGD offered his services and agreed to build this Mental Load Module into the existing RWF software.
WFS New release
Changes to the RWF manual
The WFGD has released a new version of WFS, version WFS 5.91 in April 2007.
In the content nothing has been changed, but following the language module of VWF, the WFGD has decided in close cooperation with the WFR, to add the option “Language”. From this version on, the user can choose to analyse in a Dutch language environment or a German or an English, inclusive the respective WF ”Rules”.
Improvements to the RWF manual as from January 2007.
Beside some textual improvements, the following modifications and extensions to the RWF manual have been adopted.
The most essential change is the modification regarding the additional T with connected pins and holes. This modification is the result of further consequences of various analyses of connected pins and the discrepances found, ánd the consultation of English and German manuals, ánd the book of Quick, Duncan en Malcolm.