In their view, the situational context comprises:

• Identity [presumably of the user]
• spatial information (e.g. location, orientation, speed and acceleration)
• temporal information (e.g. time of the day, date, and season of the year)
• environmental information (e.g. temperature, air quality, and light or noise level)
• social situation (e.g. who are you with, and people that are nearby)
• resources that are nearby (e.g. accessible devices, and hosts)
• availability of resources (e.g. battery, display, network, and bandwidth)
• physiological measurements (e.g. blood pressure, heart rate, respiration rate, muscle activity, and tone of voice)
• activity (e.g. talking, walking, and running)
• schedules and agenda settings

To which I would add "historical/background" information about the user and others:

• user, and others who the user has interacted with (e.g. past activities, preferences, experiences, purchases and so forth)
• social interactions (e.g. past communications, agreements, activities and so forth)

Plus related information such as:

• information about the user's plans and the user's social group's plans (e.g. a shopping list, project goals).

• information about the things, people, circumstances, locations etc. that impacts the user's perception of the situation (e.g. knowing that the collapsing friend has been diagnosed with epilepsy)