skin, cardiac monitoring would be futile.
LTTng, as a tracer, is no different from the real life examples above.
-If you're about to trace a software system, i.e. record its history of
-execution, you better have probes in the subject you're
+If you're about to trace a software system or, put in other words, record its
+history of execution, you better have probes in the subject you're
tracing: the actual software. Various ways were developed to do this.
The most straightforward one is to manually place probes, called
_tracepoints_, in the software's source code. The Linux kernel tracing
be that your tracing needs are already appropriately covered by LTTng's
built-in Linux kernel tracepoints and other probes. Or you may be in
possession of a user space application which has already been
-instrumented. In such cases, the work will reside entirely in the design
+instrumented. In such cases, the work resides entirely in the design
and execution of tracing sessions, allowing you to jump to
[Controlling tracing](#doc-controlling-tracing) right now.