The work process analyses several markers that give an insight in the overall level of risk. It approaches preventive conservation as an iterative process where indoor air quality evolves to an ideal situation as a consequence of a series of smaller and/or larger mitigation actions. The work process consists of a linear and a circular part.
- Linear part of the work process: The linear part analyses the risk related markers that remain stable for longer periods of time such as the efficiency of the protection shield surrounding a heritage collection and the sensitivity of the collection towards hazard exposure. At longer time scales, these markers do evolve: (1) the sensitivity of an object can be modified during a conservation-restoration process, or (2) the protection efficiency of one of the layers of enclosure can be improved during refurbishments. This means that the linear step should be repeated after drastic changes of the preservation conditions. The linear representation only suggests that such analysis should not be performed frequently. The linear part of the work process ends in a decision point. That decision point consists in choosing the most appropriate measuring location from a series of alternative locations in a building.
A questionnaire has been developed to support the inspection of the surroundings and the collection.
- Circular part of the work process: Several risk related markers such as the exposure and the hazard types in the risk management process change much faster. For that reason, they are analysed within a closed loop. Also the circle contains a decision point: the selection of the most appropriate mitigation action from a series of alternatives.