Legitimate interests is the most flexible basis, but the employer must weigh its interests, and how necessary the monitoring is, against what workers stand to lose in rights and freedoms in the particular case, and should run the purpose, necessity and balancing tests before starting and record the result in a legitimate interests assessment. It may not be appropriate where workers would not understand or reasonably expect the monitoring or would likely object if told; expectations vary with the job (a miner expects a tracker, an office worker does not).
This control maps to 1 controls across 1 other frameworks. If you already hold one of them, the evidence you collected for it is the starting point here rather than new work.
Every mapping shown was judged rather than inferred from wording similarity, and the ones that failed review are published too. See the coverage reports and what was rejected.
The graph holds this control, the 1 it maps to, and the evidence behind each claim, over MCP and REST.