A method for presence detection of one or more physical elements situated within a boundary defining a work area surrounding a mobile outdoor power equipment machine, the method comprising: scanning an area surrounding the mobile outdoor power equipment machine with a sensing apparatus of the mobile outdoor power equipment machine; analyzing data derived from the scanning to identify a presence of a physical element in the area, the method characterised by; analyzing data derived from the scanning to determine whether the physical element is located within the work area defined by the boundary; determining a proximity of the physical element to the mobile outdoor power equipment machine; determining a confidence level of whether the physical element is an animate being; and a control system of the mobile outdoor power equipment machine coupled to the sensing apparatus directing a first and a second behavior of the mobile outdoor power equipment, said first behavior correlating to a combination of: i) the determination of the confidence level of whether the physical element is an animate being, ii) the determination that the physical element is located within the work area, and iii) the proximity of the physical element to the mobile outdoor power equipment machine; wherein the first said behavior is in response to a first dual classification, said first dual classification comprising a first said confidence level and a first said proximity; and said second behaviour in response to a second dual classification, said second dual classification comprising: i) a second said confidence level, which second said confidence level is different from the first said confidence level, and ii) a second said proximity, which second said proximity is different from said first proximity. scanning an area surrounding the mobile outdoor power equipment machine with a sensing apparatus of the mobile outdoor power equipment machine; analyzing data derived from the scanning to identify a presence of a physical element in the area, the method characterised by; analyzing data derived from the scanning to determine whether the physical element is located within the work area defined by the boundary; determining a proximity of the physical element to the mobile outdoor power equipment machine; determining a confidence level of whether the physical element is an animate being; and a control system of the mobile outdoor power equipment machine coupled to the sensing apparatus directing a first and a second behavior of the mobile outdoor power equipment, said first behavior correlating to a combination of: i) the determination of the confidence level of whether the physical element is an animate being, ii) the determination that the physical element is located within the work area, and iii) the proximity of the physical element to the mobile outdoor power equipment machine; wherein the first said behavior is in response to a first dual classification, said first dual classification comprising a first said confidence level and a first said proximity; and said second behaviour in response to a second dual classification, said second dual classification comprising: i) a second said confidence level, which second said confidence level is different from the first said confidence level, and ii) a second said proximity, which second said proximity is different from said first proximity. i) the determination of the confidence level of whether the physical element is an animate being, ii) the determination that the physical element is located within the work area, and iii) the proximity of the physical element to the mobile outdoor power equipment machine; wherein the first said behavior is in response to a first dual classification, said first dual classification comprising a first said confidence level and a first said proximity; and said second behaviour in response to a second dual classification, said second dual classification comprising: wherein the first said behavior is in response to a first dual classification, said first dual classification comprising a first said confidence level and a first said proximity; and said second behaviour in response to a second dual classification, said second dual classification comprising: i) a second said confidence level, which second said confidence level is different from the first said confidence level, and ii) a second said proximity, which second said proximity is different from said first proximity.