Context-aware platforms goal to bring a wealthy consumer event by means of taking into account the present person context (location, time, job, etc.), possibly captured with no his intervention. for instance, cellphones at the moment are capable to continuously replace a user’s place whereas, whilst, clients execute an expanding volume of actions on-line, the place their activities can be easily captured (e.g. login in an internet software) with out consumer consent. within the final decade, this subject has noticeable a number of advancements that show its relevance and usability. The trend used to be sped up with the widespread availability of robust cellular units (e.g. smartphones) that come with a myriad of sensors which allow purposes to catch the person context. in spite of the fact that, there are numerous demanding situations that needs to be addressed; we concentrate on scalability (large variety of context conscious messages) and privateness (personal facts that could be propagated). This e-book is geared up in 5 chapters beginning with an creation to the subject matter elevating crucial demanding situations. Then, bankruptcy provides numerous important definitions (establishing a typical flooring for the next chapters) and taxonomy. These are vital to bankruptcy 3 which describes one of the most correct distributed context-aware platforms that may be categorised in accordance with the taxonomy. privateness is addressed in bankruptcy 4 and chapter five presents a few very important conclusions. The viewers for this e-book is vast; researchers, scholars and execs in the components addressed will locate the main suitable information about scalability and privateness in distributed context-aware systems.