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Background  Limited data are available on the development, implementation and evaluation processes of physical activity promotion programmes among older adults. More integrative insights into interventions describing the planned systematic development, implementation and evaluation are needed.    Methods and design  The purpose of this study is to give an integrative insight into the development of the Active  plus  programme applying the six-step Intervention Mapping protocol. The Active  plus  programme consisted of two theory- and evidence-based tailored physical activity promotion interventions, both comprising three tailored letters delivered over four months and aimed at raising awareness of insufficient physical activity, and stimulating physical activity initiation and maintenance among the over-fifties.  The first intervention, the basic tailored intervention, provided tailored letters that intervened on the psychosocial determinants of physical activity. The second intervention, the intervention  plus , provided the same tailored information but additionally provided tailored information about physical activity opportunities in the specific environment in which the older adults lived. This environment-based component also provided access to a forum and e-buddy system on a website. A plan for implementation and evaluation is also described.    Discussion  The planned development of the Active  plus  programme resulted in two theory- and evidence-based tailored physical activity interventions targeted at the over-fifties.    Trial Registration  Dutch Trial Register NTR 920

The Active plus protocol: systematic development of two theory- and evidence-based tailored physical activity interventions for the over-fifties