This paper takes up data from a Japanese company with over 1,000 employees. We conduct a complete survey using an annual questionnaire and interviews with executives over a 12-year period from FY 2004 to FY 2015 with a large reorganization. The benefits of long-term fixed-point observations of perspective index are summarized as follows: (a) We can easily check for spurious correlations. (b) Changes in time series clarify the linkage between variables and reveal variables that are not explanatory variables. (c) The causal relationship appears only when the organization is greatly shaken and many variables change. (d) Even accidental events can be treated as social experiments. (e) In essence, there is an effect like the cohort effect that cannot be clarified without long-term fixed-point observation. However, if we do not devise a way to express fixed-point observational survey data in time series, no matter how much data is accumulated, it only means increasing the sample size in cross-sectional surveys.
