  This paper describes the design, implementation, and user evaluation of an
IoT project focused on monitoring and management of user comfort and energy
usage in office buildings. The objective is to depict an instructive use case
and to illustrate experiences with all major phases of designing and running a
fairly complex IoT system. The design part includes motivation and outline of
the problem statement, the resulting definition of data to be collected, system
implementation, and subsequent changes resulting from the additional insights
that it provided. The user experience part describes quantitative findings as
well as key results of the extensive human factors study with over 70 office
users participating in two major pilots in France and Japan. The original idea
for this project came out from a diverse group of companies exploring
challenges of designing and operating smart buildings with net-positive energy
balance. Members included companies involved in the design and construction of
smart buildings, building-management and automation systems, computer design,
energy systems, and office furniture and space design. One of the early
insights was that maximum energy efficiency in office buildings cannot be
achieved and sustained without the awareness and active participation of
building occupants. The resulting project explored and evaluated several ways
to engage and empower users in ways that benefit them and makes them the
willing and active participants.
