**3. Personal knowledge management system's conception**

An appearance of innovations and new ideas in the knowledge worker (KW) level happens in all environments and in all moments over individual's time frame. For the KW it is important to have a PKMS support. A PKMS only from technological aspect will not make a successful system's integration and usage for backing the KW's task supporting process. It is important that individual himself / herself is willing to use a PKMS and is willing to stick with PKM guidelines. Here stand out the social and psychological aspects of PKMS. It is important to realize individual's everyday needs, motivation and task accomplishing satisfaction.

A well-known hierarchy of needs was published more than fifty years ago (Maslow, 1954). Maslow proposed that individual's needs are hierarchically ordered in five levels: biological and physiological, safety, belongingness and love, esteem, and self-actualization. This hierarchy usually is depicted in the form of pyramid where at its basic level are positioned biological and physiological needs (Chapman, 1995). In 1970-s hierarchy of needs was extended with levels of cognitive and aesthetic needs, but in 1990-s there was added level of transcendence needs (Maslow, 1954; Chapman, 1995).

The theory of hierarchy of needs has been also criticized being subjective and the order of needs levels being not appropriate (Boeree, 2006). However from a PKMS perspective the Maslow hierarchy order is not important. More essential is to realize that such individual needs exist and they clearly have an impact on the KW. Thus these needs have to be taken into account when developing a PKMS.

Maslow realized the existence of attitude problems regarding workers such that they have certain human basic needs and that they have the rights for self-actualization (Chapman, 1995). There are also some other problems KW-s have to deal with (Etzel & Thomas, 1996). KW-s have to identify problems within themselves and should be willing to tackle them. Thus they can improve PKMS performance from all of its three aspects.

Important traits of KW about the done task are also motivation and satisfaction. In regard of satisfaction a considerable research is done by Herzberg developing theory of two factors (Herzberg et. al., 1959) which can be directly referred also to KW-s. Regarding motivation a valuable research effort is done by McClelland who developed a theory of motivation and researched individuals' needs for achievements (McClelland, 1967). It is considered that individual's needs are developing during his / her life. Haslam states that individual's motivation is dependent on his / her self-categorization (Haslam, 2004).
