19 The second of the issues of construction relates to the extent of the exclusion in the last three lines of the definitions of "private activity" and "private conversation" respectively. Something is not a private conversation or private activity if the parties to it ought reasonably to expect that the conversation or activity may be overheard or observed. It is to be noted that the test here is largely objective. The problem arises because of the word "parties" (plural) in the exclusionary provision. The first part of the definition refers to "any of the parties". The test under the first part is primarily subjective, that is, the person must actually hold that desire, although the circumstances must also be such as to make the indication of desire "reasonable". Thus, if the circumstances reasonably indicate that any one or more, but not necessarily all, of the parties desired that the incident be observed or heard only by the principal parties, that is enough to satisfy the first part of the definition. But I do not think that the use of the word "parties" (plural) in the exclusionary provision means the definition cannot be satisfied unless all of the parties ought reasonably to have intended the incident to be restricted to themselves. It may well be the case that one of the parties (being the one who is wearing the device) knows full well that the incident is being observed or listened to by third parties. I think the term "parties" in the exclusionary provision refers primarily to the person who comes within the phrase "any party" in the earlier part of the definition but may extend to other parties as well. The words of the exclusionary provision reinforce the need for objective, as well as subjective, considerations in drawing the appropriate inferences.