Cleveland TS23 4YS. Guiding principles for the proof testing of safety instrumented systems (SIS) in the chemical industry. have been developed through research into the practices of proof testing. The proof testing of SIS is an. integral component of the management of functional safety. Its purpose is to confirm the continued.
Psychology of obsession. The definition of obsession is: the inability of a person to stop thinking about a particular topic or feeling a certain emotion without a high amount of anxiety. When obsessed, an individual continues the obsession in order to avoid the consequent anxiety.
1 In anorexia nervosa, the individual develops a phobia about being fat.  Obsession: If the individual develops persistent, unwanted thoughts about the phobia; this is defined as an obsession. In anorexia nervosa, the individual spends much of the time being obsessed with thinness, and being phobic of weight gain.